# Addition and Subtraction of Square Numbers

In this worksheet, students add together square numbers. They should try the calculations mentally first.

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Understand Integer Powers/Real Roots

Difficulty level:

### QUESTION 1 of 10

For this worksheet, it will be useful for you to know the square numbers off by heart.

12 = 1

22 = 4

32 = 9

42 = 16

52 = 25

62 = 36

72 = 49

82 = 64

92 = 81

102 = 100

112 = 121

122 = 144

It's also useful to know that 152 = 225

Example

Work out the following mentally.

52 + 10 =
 25 + 10 = 35

Work out the following mentally. Write just the answer in the box below.

 62 + 10 = ?

Work out the following mentally. Write just the answer in the box below.

 42 + 12 = ?

Work out the following mentally. Write just the answer in the box below.

 32 + 12 = ?

Work out the following mentally. Write just the answer in the box below.

 22 + 11 = ?

Work out the following mentally. Write just the answer in the box below.

 22 + 112  = ?

Work out the following mentally. Write just the answer in the box below.

 72 + 52  = ?

Work out the following mentally. Write just the answer in the box below.

 42 + 82  = ?

Work out the following mentally. Write just the answer in the box below.

 72 + 112  = ?

Work out the following mentally. Write just the answer in the box below.

 (9 + 6)2  = ?

Work out the following mentally. Write just the answer in the box below.

 (11 + 4)2 = ?
• Question 1

Work out the following mentally. Write just the answer in the box below.

 62 + 10 = ?
46
EDDIE SAYS
BODMAS tells us we have to do powers before addition.
• Question 2

Work out the following mentally. Write just the answer in the box below.

 42 + 12 = ?
28
EDDIE SAYS
BODMAS tells us we have to do powers before addition.
• Question 3

Work out the following mentally. Write just the answer in the box below.

 32 + 12 = ?
21
EDDIE SAYS
BODMAS tells us we have to do powers before addition.
• Question 4

Work out the following mentally. Write just the answer in the box below.

 22 + 11 = ?
15
EDDIE SAYS
BODMAS tells us we have to do powers before addition.
• Question 5

Work out the following mentally. Write just the answer in the box below.

 22 + 112  = ?
125
EDDIE SAYS
BODMAS tells us we have to do both powers before adding the answer.
• Question 6

Work out the following mentally. Write just the answer in the box below.

 72 + 52  = ?
74
EDDIE SAYS
BODMAS tells us we have to do both powers before adding the answer.
• Question 7

Work out the following mentally. Write just the answer in the box below.

 42 + 82  = ?
80
EDDIE SAYS
BODMAS tells us we have to do both powers before adding the answer.
• Question 8

Work out the following mentally. Write just the answer in the box below.

 72 + 112  = ?
170
EDDIE SAYS
BODMAS tells us we have to do both powers before adding the answer.
• Question 9

Work out the following mentally. Write just the answer in the box below.

 (9 + 6)2  = ?
225
EDDIE SAYS
BODMAS tells us we have to work out the bracket before squaring the result
• Question 10

Work out the following mentally. Write just the answer in the box below.

 (11 + 4)2 = ?
225
EDDIE SAYS
BODMAS tells us we have to work out the bracket before squaring the result
---- OR ----

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