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Place Value
Friendly Numbers
Find the unknown
100

Decompose 61 by place value.

60 and 1

100

27 + 32

Make 27 a friendly number and solve

27 will become 25, so 32 will become 34.

the answer is 59

100

32  + 7 = 33 + 6

True or false

True

200

Decompose 97 by place value.

90 and 7

200

Make 42 a friendly number

40 or 45

200

12 + ___ = 10 + 8

6

300

Decompose 42 by place value

Decompose 36 by place value

What is 42+36?

40 and 2

30 and 6

78

300

14 + 6 

Make friendly numbers and add

15 and 5 

=  20

300
40 + ___ = 17 + 50

27

400

Decompose 87 by place value

what is 87 plus 10?

80 and 7

97

400

22 + 12

Make friendly numbers and add

20 and 14

or

24 and 10

the answer is 34

400

56 + 9 = ___ + 42

23

500

Decompose 55 by place value

Decompose 39 by place value

What is 55 + 39?

50 and 5

30 and 9

94

500

87 and 9

Make friendly numbers and add

90 and 6

or 

10 and 86

= 96

500

58 + 19 = 31 + 13

True or false

False