Subtraction to 20 worksheet: Subtract within 20 worksheets | K5 Learning

Addition and Subtraction Within 20 Facts & Worksheets For Kids

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Children start to develop strategies for adding and subtracting whole numbers on the basis of their earlier exposure with smaller numbers. After learning the properties of addition and subtraction, kids now understand the connections between counting and the operations.

See the fact file below for more information on the addition and subtraction within 20 or alternatively, you can download our 35-page Addition and Subtraction Within 20 worksheet pack to utilise within the classroom or home environment.

Key Facts & Information

ADDITION: A REVIEW

• Review the basics of addition. The first thing to do to make children understand addition is to let them know about this important symbol.

ADDITION: OBJECTS TO NUMBERS

• Once the kids understand the idea of counting objects to do addition, introduce them to the idea of adding numbers. First, let them write the objects as numbers.
• Once identified, present the number line and start introducing how addition works via the number line.

ADDING NUMBERS

• The kids should now have an understanding of adding objects by counting them and the idea of converting objects to numbers and then adding them. Now, start introducing the idea of adding numbers.
• To help them understand this better, you can use objects (by introducing conversion of numbers to objects) or by using the number line.
• Convert the numbers to simple objects and then go back to their previous understanding of addition by counting objects.

SUBTRACTION: A REVIEW

• Review the basics of subtraction. The first thing to do to make children understand subtraction is to let them know about this important symbol.

SUBTRACTION: COUNT WITH OBJECTS

• Present a subtraction word problem and explain the problem with a drawing.
• Draw 12 bananas on the board or on a sheet of paper. Ask your children to count the bananas and label each banana with a number.
• As you explain that Marcel the monkey ate 3 bananas, cross out or erase 3 bananas, and then ask them how many bananas are left.
• Explain the problem with objects. Show a monkey puppet and place 12 bananas on the table and ask your child to count the bananas. Hide 3 bananas from the table, explaining that Marcel the monkey already ate the bananas. Ask the kids to count the number of bananas left on the table.
• When using objects, replace the items you use so students can learn that math rules are universal. For instance, work through a problem using bananas, then do it again with balls.
• Write a number sentence. Discuss with your pupils that you can represent this word problem with a number sentence. Guide them through the process of translating the word problem into a number sentence.

SUBTRACTION: OBJECTS TO NUMBERS

• Present your students with a subtraction problem.
• Use a number line to solve the problem. Draw a number line that ranges from 0 to 10.
• Write a number sentence. Discuss with your pupils that you can represent this word problem with a number sentence. Guide them through the process of translating the word problem into a number sentence.

TEACHING ADDITION AND SUBTRACTION WITH FACT FAMILIES

• A fact family is a set of facts or mathematical problems, which use the same numbers. Three numbers make up a fact family. These numbers can be added or subtracted in different methods.
• For instance, the numbers 7, 8, and 15 form a fact family, which can create two addition number sentences and two subtraction number sentences.
• Present your students with a subtraction problem.
• Use a fact family to solve the problem. Create two addition and two subtraction number sentences.

COMMON CORE ADDITION AND SUBTRACTION

• Common Core presents subtraction as measuring the distance between two points. To let your kids visualize, draw a number line ranging from 0 to 10.
• Common Core presents addition and subtraction as measuring the distance between two points. To let your kids visualize, draw a number line ranging from 0 to 20.

Addition and Subtraction Within 20 Worksheets

This is a fantastic bundle which includes everything you need to know about the Addition and Subtraction Within 20 across 35 in-depth pages. These are ready-to-use Addition and Subtraction Within 20 worksheets that are perfect for teaching students to develop strategies for adding and subtracting whole numbers on the basis of their earlier exposure with smaller numbers. After learning the properties of addition and subtraction, kids now understand the connections between counting and the operations.

Complete List Of Included Worksheets

• Lesson Plan
• Addition and Subtraction Within 20
• Add or Subtract?
• Number Bonds
• Frog Jump
• Is There a Difference?
• Missing Numbers
• Subtract Then Add
• Add Then Subtract
• Solving Problems
• Stating the Problem
• Color by Operation

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Use With Any Curriculum

These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.

Subtraction Facts to 20 — Maths with Mum

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Subtraction Facts to 20

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• To subtract from 20 it helps to know the number bonds to 20.
• To learn the number bonds to 20, start with the number bonds to 10 and put a ‘1’ tens digit in front of one of the numbers in the pair.

• 20 – 8 can be worked out using number bonds.
• The number 2 adds to 8 to make 10.
• 20 is ten larger than 10 and so, 12 adds to 8 to make 20.
• 10 – 8 = 2 and so, 20 – 8 = 12.

When subtracting from 20, the answer is ten more than if we had subtracted from 10.

• Here we have 20 – something = 5.
• The missing number is the number that we add to 5 to make 20.
• 5 + 5 = 10 and so, 5 + 15 = 20.
• Therefore 20 – 15 = 5.
• The missing number is 15.
• The missing number is 10 larger than the number bond to 10 that goes with 5.

Subtraction Facts to 20 Worksheets and Answers

Number facts to 20 are the pairs of numbers that add to make twenty and they are often written in the form of a sum.

Subtraction facts to 20 are subtraction sums in which we are subtracting from 20.

To subtract from 20 we should know the number bonds to 20. The number bonds to 20 are pairs of numbers that add to make 20.

To learn the number bonds to 20, start with the number bonds to 10 and add a ten to one of the numbers in each pair. We do this by adding a ‘1’ tens digit in front of one of the numbers.

Here is our first example of subtracting from 20.

We have 20 – 8.

From the number bonds to 10 we know that 8 + 2 = 10.

8 + 2 = 10 and so, 8 + 12 = 20.

Because 8 + 12 = 20, 20 – 8 = 12.

The missing number in this subtraction fact is 12.

To subtract a number from 20, we can see how many more we add to this number to make 20. To subtract a single digit number from 20, the answer will be 10 more than this number’s number bond to 10.

For example, we subtracted 8 from 20 and so we add 10 to the number that adds to 8 to make 10. We add 10 to 2 to get the answer of 12.

Here is another example of subtracting from 20. We have 20 – 6.

Using the number bonds to 10, 6 + 4 = 10.

Therefore 6 + 14 = 20.

And so 20 – 6 = 14.

The missing number is 14, which is 10 more than 6’s number bond to ten.

In this example we will subtract a 2-digit number from 20. We have 20 – 12.

We can see that 12 ends in a ‘2’.

2 + 8 = 10

And so, 12 + 8 = 20.

The answer to 20 – 12 is 8.

To subtract a 2-digit number from 20, the answer will be the number bond to ten of the number that is 10 less than the number being subtracted.

In this example we are subtracting 12 and so the answer is the number bond to ten that goes with 2.

8 is the answer.

In this example we are finding the missing number in the middle of a subtraction fact to 20.

20 – something = 5.

The missing number is the number that can be added to 5 to make 20.

5 + 5 = 10 and so,

5 + 15 = 20.

The missing number is 10 more than the number bond to ten of the answer.

Here is an example of 20 – something = 3.

We start by looking at the answer to the subtraction, which is 3.

3 + 7 = 10 and so,

3 + 17 = 20.

Therefore 20 – 17 = 3.

The missing number is 17, which is ten more than 3’s number bond to ten.

Now try our lesson on Addition using the Compensation Strategy where we learn how to add numbers using the compensation strategy.

Short -term mathematics plan on the topic «Addition of numbers within 20» grade 1 (according to the updated formation program of the Republic of Kazakhstan)

per curriculum):

values ​​

Offer to lay out the numbers 10, 20 using counting sticks. In this case, first graders will need to combine dozens of sticks into bundles.

After the students have completed this activity, have them write down the number 14 using counting sticks (to set aside 1 tens and 4 ones).

Tell the children that in the lesson they will learn how to add two-digit numbers to single-digit numbers. Ask them to add 3 to 14 (students will add 3 sticks).

Watch the guys in action.

Ask:

Ask the students to determine the total number of sticks (17).

Have the children write down this action using a number expression.

Write the expression 14 + 3 on the board. Ask if the value of the given expression can be found using a number line. Let the children do this in groups.

Lead them to the formulation of the conclusion: in order to add a single-digit number to a two-digit number, you need to take as many steps to the right along the number line as there are units in the second number.

Reinforce your conclusion with similar examples. For example, find out how much it will be if 3 is added to 14, 3 is added to 15, and so on. You can perform these actions based on a drawing or on a numerical beam.

0 draw up a drawing example for addition. This task is aimed at strengthening the skill of addition with the help of a number beam using the example of the numbers of the second ten. Since the direction of the hedgehog is from left to right, students will recognize that this is an addition, not a subtraction. Next, they will count the steps from the hedgehog to the apple and make up the equation 5 + 10 = 15.

Do the addition. The job is intended for frontal work. It is desirable that students, at the initial acquaintance with the method of calculation, give detailed explanations of the actions performed. Solve the first example with the whole class. Students will be able to repeat the course of reasoning after the teacher when solving. As a result of this work, they will be able to remember the method of adding numbers under consideration without going through a dozen. Ask the students to solve the rest of the examples in pairs. As you test, ask them to say the names of the components of the addition first, and then the answers.

Provide assistance to pairs of students who will have difficulty completing an assignment.

The children will be able to record their answers on sheets of laminated paper. After completing the task, pairs of students will raise their sheets to peer-check their work.

Answers

a) 18; 6-20; c) 15; d) 19.

Poultry. Invite students to familiarize themselves with the content of the assignment. Group them into groups to complete the solution. Invite one representative from the group to announce the decision. Have a discussion.

Answer

13 birds in the poultry yard.

Try it. Ask to do the task in pairs or small groups.

*In the context of themes:					» My Family and Friends”, “The World Around Us”
School:
Date: “____”____________20___					Name of the teacher:
Class: 1 «____» class.					The number of those present: absent:
Lesson theme:
1.1.2.1 understand the action of addition as the union of sets that do not have common elements and subtraction as the removal of a part of the set 1.1.2.4 draw up, know and apply the addition table of single-digit numbers without passing through ten 1.1.2.3 use the commutative addition property; 1.5.2.2 use the signs «+», «-«, «=»
Lesson objectives:		understand the action of addition as the union of sets that do not have common elements, and the action of subtraction as the removal of a part of the set; perform verbal addition and subtraction without passing through ten: numbers within 20, addition and subtraction of tens; use the signs «+», «-«, «=».
success criteria In the lesson, the guys will get acquainted with the reception of numbers within 20 without crossing the category, learn to solve examples of the type 14 + 3.
values ​​based on a national «Mangilik el»: Kazakhstani patriotism and civic responsibility; respect; cooperation; work and creativity; openness; education throughout life.					Textbook: Addition of numbers within 20, p. 98-99. Workbook: Worksheet 95 “Adding numbers within 20”, p. 97. Worksheet 96 “Adding numbers within 20”, p. 98.
Success criteria
Middle Lesson
Resources: counting sticks; geometric figures: 14 green and 3 red circles; letter cards; number beam with large numbers from 1 to 20; A4 laminated paper and markers for each person.
Success criteria
Success criteria	When completing the task, the guys will solve examples within 20, analyze the results and be able to conclude: the rule «When you add one to any number, you always get the next number» works not only with single-digit, but also with double-digit numbers.
Differentiation How do you plan to provide more support? What tasks do you plan to set for more capable students?				Assessment How do you plan to check the level of mastery of the material by students? Use this section to write down the methods you will use to assess what students have learned during the lesson.		Health and safety Health-saving technologies. Used physical minutes and activities.
Additional tasks Solve the examples and fill in the circles. The task is aimed at practicing addition skills within 20. Students will be able to solve the proposed examples. As an illustration of the method used, the children should draw a picture for each example . In this case, the circles denoting the first number in the example are painted by students in one color, for example, blue, and the circles corresponding to the second number in the example record must be painted in a different color, for example, red. This will allow them to visually self-check their work. Answer 15+ 3 = 5 + 3 + 10= 18; 16+ 2 = 6 + 2+ 10= 18; 18 + 1 = 8 + 1 + 10 = 19, Think up and write 4 addition examples. First-graders will be able to independently make 4 examples of adding numbers within 20 and solve them. To check their calculations, the guys will be able to use the number beam. Put together puzzles. Students will be able to verbally solve the given examples and match them with the answers. In doing so, they will be able to connect the examples from the right column with the answers from the left column with lines. Answer 18 = 13 + 5; 14= 12+2; 16= 15 + 1; 17=14 + 3; 13_= 1 1_+2. Solve the examples using the number line. In this case, students will be able to solve the example on the number line and write down the answer for the example. And they can also solve the example verbally and check it with the help of a number beam. Invite the children to make their own examples of adding numbers within 20 and draw pictures for them. Answer				By the end of the lesson, students will be able to verbally add up to 20 without going through a dozen. To determine the level of assimilation of educational material by first-graders, ask questions: How can two-digit numbers be added to single-digit numbers within 20? How much do you get if you add 2 to 13? 12 increase by 4. What is the result? Gulnara read 12 books during the autumn holidays, and Daniyar read 7. How many books did the children read in total? Organize student self-assessment using the Ladder of Success in your workbook.		Dynamic pause We clap in their hands, clap, clap clap over the head We stomp, TOP Raise the knees Swing up heads back head back 22 We raise our hands, we lower our hands raise, lower our hands We squat low and we stand up straight squat and jump Math lesson in 91 class on the topic Adding and subtracting round numbers mathematics *In the context of topics: «My family and friends», «The world around us» School: No. 41 Date: «15» 11/2016 Name of the teacher: Tursinbayeva Z.K. Class: 1 «G» class. Number of people present: 32 missing: — Lesson topic: Adding and subtracting round numbers Learning objectives achieved in this lesson (link to curriculum): 1.1.1.4 form an enlarged unit of account — ten; count, in tens to 100, write down, compare 1.4.3.1 make a sequence of numbers up to 20 / tens up to 100, identify patterns in a sequence of drawings, shapes, symbols, numbers within 100 1.1.2.5 verbally perform addition and subtraction without going over tens: numbers within 20/addition and subtraction of tens Lesson objectives: perform verbal addition and subtraction without jumping through ten: numbers within 20, addition and subtraction of tens; make a sequence of numbers up to 20, tens up to 100, determine the pattern in the sequence of drawings, figures, characters, numbers within 100. Success criteria to teach oral addition and subtraction of numbers, ending in zero without going through a ten. In this lesson, first graders will learn how to add and subtract tens within 100 using addition and subtraction skill single digit numbers. To add or subtract numbers, ending in zero, add or subtract tens and add right zero. Inoculation valuables Values ​​based on the national idea «Mangilik el»: Kazakh patriotism and civic responsibility; respect; cooperation; work and creativity; openness; education in throughout life. Interdisciplinary communications Skills use ICT In this lesson, students use preliminary knowledge Lesson progress Lesson steps Planned activity in the lesson Resources Beginning of the lesson Motivation for learning activities: He orders a hundred children: Then sit down and study, Then get up — disperse. What is this? (Call.) What did the call tell you? (Start learning.) Tell me, is it possible to force someone to study? (No he should want it.) I’m sure you want to learn. What does it mean to «learn»? (This means to understand what we do not yet know, and to discover way.) What topic did you start studying in the last lesson? (Check dozens.) Today you will continue to study the world of numbers. Wish a friend good luck friend! How do we always start work? (With repetition of the necessary knowledge.) Knowledge update. — Please count in chorus from 1 to 20. Draw numbers from 0 to 20 on the number line. — From numbers located on the number line name all the even ones. — Name all the odd numbers. — What is the number that follows the number 12. — The number that precedes the number 15. — The number that is on the number line between the numbers 17 and 19. — Name the «neighbors» of the number 19. — What is the number in which: 1 ten 5 units; 1 ten 2 units; 1 ten 9 units; 2 tens. — Count down the numbers from 20 to ten. Introductory task. Work in pairs. — Guys, work in pairs, come up with a friend for a friend, examples of adding and subtracting tens. (Watching work I identify guys who find it difficult to compile , perhaps they did not learn the material) Success criteria I provide assistance to children experiencing difficulties in applying this approach. During the individual conversations can adjust their knowledge. Middle of the lesson Confectionery. — Children look at the picture and say how many cakes they baked confectioner. How will you act? lead them to the conclusion that that counting one at a time is a very laborious task. Suggest find out the total number of cakes using addition. Repeat with first graders decimal composition of numbers and conditional abbreviation the words «ten» when writing. Suggest using the learned method for counting: add the number of tens in the number and add zero. Calc. In pairs, students can figure out which number is hidden. behind the torso. -«Which action component is not known?» During the calculations, the guys conclude that the same number can be get by the method of counting by 10, as well as by the method counting by 10. The important point is the starting point, which the guys will be able to determine during the task. At they will be able to use the demo table of tens from 10 to 100. Reply a) 30; b) 90; c) 60; d) 0. Try it. — Calculate how many steps the snow leopard has to take to reach your kittens? Let’s do a peer review. Reply 70. Think. — I made a number. I added 50 to it and got 80. What is the number did I guess? Come up with similar riddles with round numbers. (We decide several tasks invented by myself) Tutorial: Adding and Subtracting Round Numbers, p. 94-95. Workbook: Worksheet 91 Learn to Add and Subtract Tens, p. 93. Worksheet 92 Adding and Subtracting Round Numbers, p. 94. Resources: Success criteria Reply I guessed the number 30. End of lesson Decide. -20 boys and 10 girls. How many children participated in the competition? During the discussion of the solution, I draw attention to first graders to use the open method. I give to students the ability to add the number of tens first, thereby completing action with single digits. Let’s convert the answer to a number. Success criteria Answer 30 children. Differentiation How do you plan to provide more support? What kind Do you plan to set tasks for more capable students? Assessment How do you plan to check the level of assimilation of the material students? Health and safety Additional tasks Pick up the key to the lock. When completing the assignment, students will be able to connect with a line the door under which the example is written, and the key with correct answer for this example. Answers 60 + 10 = 70; 50-10 = 40; 70+ 10 = 80; 40- 10 = 30. Knowledge chest. Children will be able to fill in the gaps in the tables like this way to get related numeric expressions (examples). For the purposes of differentiation, use the task on the third chest. Students will independently select the original round number and get their own version of the task. By the end of the lesson, students will be able to add and subtract round numbers within 100 without crossing the digit. By alexxlab View Archive → Similar Posts