Adding within 100

Grade 2 · Level 3 · Sheet 1

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the answers

Name Date

Free from tutor.in4me.app · 2.NBT.B.5, 2.OA.A.1 · Five minutes a day online, and the difficulty follows your child.

1.
?+23=92
2.
?+36=77
3.
59+?=80
4.
?+21=27
5.
?+19=69
6.
?+50=81
7.
5+?=64
8.
46+?=91
9.
?+8=32
10.
?+19=95
11.
93+?=97
12.
79+?=94

Show the answer key

1.69
2.41
3.21
4.6
5.50
6.31
7.59
8.45
9.24
10.76
11.4
12.15

The mistakes behind most wrong answers

A wrong answer in adding within 100 is rarely random. These are the ones that come up most often, each on a real problem — worth knowing before you mark a sheet, because the fix for each is different.

92+?=98
The answer is 6. A child who answers 7 probably counted one too many or too few.
?+9=30
The answer is 21. A child who answers 9 probably answered with one of the numbers shown.
?+1=99
The answer is 98. A child who answers 99 probably added instead of taking away.
92+6=?
The answer is 98. A child who answers 86 probably took away instead of adding.

In the app, every wrong answer is matched against mistakes like these, and the weekly email tells you which one your child keeps making — in those words, not as a percentage.

Answer key · Adding within 100 · Level 3 · Sheet 1

The mistakes behind most wrong answers