PRIMARY 1

Rev Up! Math

Name

Tutor

Topic Subtraction Within 10 (Lesson 5)

Subtraction Within 10 (Lesson 5)

Primary 1: Rev Up! Math

There are 3 bears in this family.

Papa Bear went to the forest to hunt for food.

How many bears are there left?

Note:

When we are looking for the part, we subtract.

Total Part Went to the forest

Part Left (or Remainder)

Whole

Subtraction equation:

Whole - Part Part

=

There are bears left.

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Primary 1: Rev Up! Math

TakingAway: Whole: Part

penguins are left.

We can Part

cross out penguins walk away.

these 4

since we

are

taking

away.

Subtraction equation: -=

penguins are left.

Counting Backwards:

Whole 12 3 4 5 6

penguins - =

Part

4 penguins walk away

Part Subtraction

penguins left equation:

penguins are left.

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Primary 1: Rev Up! Math

Exercise 1: Fill in the missing numbers to complete the number bonds.

1 5

3 5

12

2 6

10 8

4 5

*3 7

8

6

2

6

*4 9

8 10

7

5

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Primary 1: Rev Up! Math

Exercise 2: Look at the pictures. Complete the subtraction equations.

Eg.

5-2= 3

1 8-5=

2 10 - 7 =

3 6- =

* 4 7- =

5 -=

6 -=

*7 - =

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Primary 1: Rev Up! Math

Exercise 3: Look at the pictures. Then fill in the blanks with the

correct answers.

1

is 1 less than 5.

2

is 2 less than 10.

*3

is 4 less than 9.

Exercise 4: Use the number line to count backwardsto help you

work out each answer.

123456789

1. 2 less than 4 is .

2. 4 less than 4 is .

.

*3. 3 less than 8 is

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Primary 1: Rev Up! Math

Exercise 5: Complete the number bonds to show the parts and

wholes. Then complete the subtraction equations. Part

Whole

1.

5

5- 3= Part

2.

8- 4=

3.

6- 6=

*4.

10 - 6 =

* 5.

9- 7=

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Primary 1: Rev Up! Math

Exercise 6: Complete the number bonds. Then, write two subtraction

equationsfor each picture.

Example:

2 6- 4= 2

6

4 6- 2= 4

1)

-= 6

-= 10

2) 3

9

-=

-=

* 3)

-= 1

-= 6

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Primary 1: Rev Up! Math

Exercise 7: Fill in the boxes with the correct answer.

E.g. 10 butterflies

There are 3 mosquitoes

7 fewer mosquitoes than butterflies.

1.

cars

boys

There are more cars than boys.

2.

prawns

There are

3. crabs

fewer crabs than prawns.

teddy bears

There are honey jars

more teddy bears than honey jars.

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Primary 1: Rev Up! Math

Extension

Exercise 8: Find the patterning in the number sequence and work

out the followingsums.

1. 1 , 3 , 6 , 10 , 15 , ,

1 , 3 , 6 , 10 , 15 , 21 , 28

+2 +3 +4 +5 +6 +7

2. 1 , 5 , 9 , 13 , 17 , ,

1, 5, 9 , 13 , 17 , ,

+ + + ++ +

3. 1 , 4 , 7 , 10 , 13 , ,

1, 4, 7 , 10 , 13 , ,

+ + + ++ + 9

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Primary 1: Rev Up! Math

4. 2, 3, 5, 8, 12, ,

5. 1, 4, 9, 16, 25, ,

6. 2, 7, 12, 17, 22, ,

7. 3, 6, 10, 15, 21, ,

8. 5, 7, 10, 14, 19, ,

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