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Addition and Subtraction Facts to 100 (2)

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 (2)' worksheet

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Addition/Subtraction Facts to 100

Difficulty level:  

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  76 + 9 

 

Answer

We split 76 into 70 and 6.

We now need to work out

70 + 6 + 9

 

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

6 + 9 = 15

 

 So

      76 + 9   = 70 + 6 + 9

   = 70 + 15 = 85

 

 

Example 2

Subtract  85 - 9 

 

Answer

We split 85 into 70 and 15.

We now need to work out

70 + 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

       85 - 9  = 70 + 15 - 9

   = 70 + 6  = 76

Add 

86 + 8

Subtract 

54 - 7

Add 

66 + 8

Subtract 

34 - 6

Add 

43 + 8

Subtract 

54 - 5

Add 

55 + 8

Subtract 

64 - 3

Add 

96 + 2

Subtract 

82 - 8

  • Question 1

Add 

86 + 8

CORRECT ANSWER
94
EDDIE SAYS
80 + 6 + 8 = 80 + 14
  • Question 2

Subtract 

54 - 7

CORRECT ANSWER
47
EDDIE SAYS
40 + 14 - 7 = 40 + 7
  • Question 3

Add 

66 + 8

CORRECT ANSWER
74
EDDIE SAYS
60 + 6 + 8 = 60 + 14
  • Question 4

Subtract 

34 - 6

CORRECT ANSWER
28
EDDIE SAYS
20 + 14 - 6 = 20 + 8
  • Question 5

Add 

43 + 8

CORRECT ANSWER
51
EDDIE SAYS
40 + 3 + 8 = 40 + 11
  • Question 6

Subtract 

54 - 5

CORRECT ANSWER
49
EDDIE SAYS
40 + 14 - 5 = 40 + 9
  • Question 7

Add 

55 + 8

CORRECT ANSWER
63
EDDIE SAYS
50 + 5 + 8 = 50 + 13
  • Question 8

Subtract 

64 - 3

CORRECT ANSWER
61
EDDIE SAYS
50 + 14 - 3 = 50 + 11 or count back 3
  • Question 9

Add 

96 + 2

CORRECT ANSWER
98
EDDIE SAYS
90 + 6 + 2 = 90 + 8
  • Question 10

Subtract 

82 - 8

CORRECT ANSWER
74
EDDIE SAYS
70 + 12 - 8 = 70 + 4
---- OR ----

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