Word Problem
Find the Missing Number
Adding Four 2- Digit #
Add Mentally
Add
100

The answer in the example is incorrect. Spot the mistake. 

   178

+ 384

_________

   5 5 2

   178

+ 384

_________

   562

100

  4 6 

+3 _

______

  7 9 

3

100

  40 

+16

  32 

  27

_____

115

100

7 + 6

13

100

 75 + 87 = 

162

200

Lucia has 215 blue beads and 126 green beads. How many beads does Lucia have in all?

341 beads in all

200

  4  _

+2 3

_____

  7 2

9

200

28 + 52 + 17 + 15 =

112

200

37 + 8 = 

45

200

39 + 59 = 

98

300

Kwan's class borrowed 37 storybooks. There were 54 storybooks left.  How many storybooks were there at first? 



37 + 54 = 91

300

  1 _ 5

+1 1 4

_________

  3 0 9

9
300

36 + 23 + 34 + 12 =

105

300

78 + 5 = 

83

300

153 + 449 = 

602

400

A librarian buys 68 Spanish books and 121 English books. How many books does the librarian buy in all?

68 + 121 = 189

400

 1 _ 2 

+ 2 3 

_______

  1 9 5

7

400

29 + 15 + 62 + 38 = 

144
400

768 + 99 =

867

400

473 + 398 =

871

500

Two boxes of books were donated to the school library. There were 325 books in all. Which two boxes were donated to the school?

Box A = 176

Box B = 166

Box C = 159

Box B and Box C

500

54 + 28 + 36 + _____ = 129

11

500

138 + 298 + 127 + 86 =

649

500

583 + 98

681

500

1564 + 358 = 

1922

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