Adding up to 20
Grade 1 · Level 1 · Sheet 1the answers
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- 1.14+5=?
- 2.2+1=?
- 3.12+5=?
- 4.2+5=?
- 5.10+4=?
- 6.6+11=?
- 7.1+12=?
- 8.9+10=?
- 9.5+2=?
- 10.15+4=?
- 11.18+1=?
- 12.11+6=?
Show the answer key
- 1.19
- 2.3
- 3.17
- 4.7
- 5.14
- 6.17
- 7.13
- 8.19
- 9.7
- 10.19
- 11.19
- 12.17
Answer key · Adding up to 20 · Level 1 · Sheet 1
- 1.19
- 2.3
- 3.17
- 4.7
- 5.14
- 6.17
- 7.13
- 8.19
- 9.7
- 10.19
- 11.19
- 12.17
The mistakes behind most wrong answers
A wrong answer in adding up to 20 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.
- 7+12=?
The answer is 19. A child who answers 5 probably took away instead of adding.
- 5+2=?
The answer is 7. A child who answers 6 probably counted one too many or too few.
- 1+5=?
The answer is 6. A child who answers 1 probably answered with one of the numbers shown.
- 9+1=?
The answer is 10. A child who answers 0 probably lost track of the ten.
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.