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Addition and Subtraction Facts to 100 (1)

In this worksheet, students must know by heart their addition and subtraction number bonds to 20 and use them to derive related facts to 100.

'Addition and Subtraction Facts to 100 (1)' worksheet

Key stage:  KS 1

Curriculum topic:  Number: Addition and Subtraction

Curriculum subtopic:  Use Addition/Subtraction Facts to 100

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

Look at this number square, which shows all the bonds you should know by heart up to 20.

 

 

You can use this table to work out additions and subtractions right up to 100.

 

Example 1

Add  36 + 9 

 

Answer

We split 36 into 30 and 6.

We now need to work out

30 + 6 + 9

 

You should know this by heart, but the number square shows that

6 + 9 = 15

 

 So

      36 + 9   = 30 + 6 + 9

   = 30 + 15 = 45

 

 

Example 2

Subtract  25 - 9 

 

Answer

We split 25 into 10 and 15.

We now need to work out

10 + 15 - 9

You should know this by heart, but the number square shows that

15 - 9 = 6

When you subtract, the starting number is inside the square.

 

 

 So

       25 - 9  = 10 + 15 - 9

    = 10 + 6 = 16

Add 

56 + 8

Subtract 

24 - 7

Add 

36 + 10

Subtract 

24 - 6

Add 

23 + 8

Subtract 

24 - 5

Add 

35 + 8

Subtract 

34 - 3

Add 

56 + 2

Subtract 

22 - 8

  • Question 1

Add 

56 + 8

CORRECT ANSWER
64
EDDIE SAYS
50 + 6 + 8 = 50 + 14
  • Question 2

Subtract 

24 - 7

CORRECT ANSWER
17
EDDIE SAYS
10 + 14 - 7 = 10 + 7
  • Question 3

Add 

36 + 10

CORRECT ANSWER
46
EDDIE SAYS
30 + 6 + 10 = 30 + 16 or 30 + 10 + 6
  • Question 4

Subtract 

24 - 6

CORRECT ANSWER
18
EDDIE SAYS
10 + 14 - 6 = 10 + 8
  • Question 5

Add 

23 + 8

CORRECT ANSWER
31
EDDIE SAYS
20 + 3 + 8 = 20 + 11
  • Question 6

Subtract 

24 - 5

CORRECT ANSWER
19
EDDIE SAYS
10 + 14 - 5 = 10 + 9
  • Question 7

Add 

35 + 8

CORRECT ANSWER
43
EDDIE SAYS
30 + 5 + 8 = 30 + 13
  • Question 8

Subtract 

34 - 3

CORRECT ANSWER
31
EDDIE SAYS
20 + 14 - 3 = 20 + 11 or count back 3
  • Question 9

Add 

56 + 2

CORRECT ANSWER
58
EDDIE SAYS
50 + 6 + 2 = 50 + 8
  • Question 10

Subtract 

22 - 8

CORRECT ANSWER
14
EDDIE SAYS
10 + 12 - 8 = 10 + 4
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