Ten more, ten less

Grade 1 · Level 2 · Sheet 1

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the answers

Name Date

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1.
What is 10 less than 69?
69
Answer:
2.
What is 10 less than 41?
41
Answer:
3.
What is 10 less than 59?
59
Answer:
4.
What is 10 less than 23?
23
Answer:
5.
What is 10 less than 50?
50
Answer:
6.
What is 10 less than 31?
31
Answer:
7.
What is 10 less than 62?
62
Answer:
8.
What is 10 less than 46?
46
Answer:
9.
What is 10 less than 24?
24
Answer:
10.
What is 10 less than 76?
76
Answer:
11.
What is 10 less than 93?
93
Answer:
12.
What is 10 less than 79?
79
Answer:

Show the answer key

1.59
2.31
3.49
4.13
5.40
6.21
7.52
8.36
9.14
10.66
11.83
12.69

The mistakes behind most wrong answers

A wrong answer in ten more, ten less 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.

What is 10 less than 92?
92
The answer is 82. A child who answers 91 probably lost track of the ten.
What is 10 less than 21?
21
The answer is 11. A child who answers 21 probably started counting from the wrong number.
What is 10 less than 98?
98
The answer is 88. A child who answers 108 probably added instead of taking away.
What is 10 more than 71?
71
The answer is 81. A child who answers 61 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 · Ten more, ten less · Level 2 · Sheet 1

The mistakes behind most wrong answers