Adding up to 20
Grade 1 · Level 2 · Sheet 1the answers
Free from tutor.in4me.app · 1.OA.B.4, 1.OA.D.8, 1.OA.C.6, 1.OA.A.1 · Five minutes a day online, and the difficulty follows your child.
- 1.2+8=?
- 2.8+8=?
- 3.9+2=?
- 4.9+9=?
- 5.7+9=?
- 6.6+7=?
- 7.6+9=?
- 8.9+1=?
- 9.8+5=?
- 10.7+3=?
- 11.8+3=?
- 12.3+7=?
Show the answer key
- 1.10
- 2.16
- 3.11
- 4.18
- 5.16
- 6.13
- 7.15
- 8.10
- 9.13
- 10.10
- 11.11
- 12.10
Answer key · Adding up to 20 · Level 2 · Sheet 1
- 1.10
- 2.16
- 3.11
- 4.18
- 5.16
- 6.13
- 7.15
- 8.10
- 9.13
- 10.10
- 11.11
- 12.10
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.
- 9+1=?
The answer is 10. A child who answers 8 probably took away instead of adding.
- 9+2=?
The answer is 11. A child who answers 10 probably counted one too many or too few.
- 7+4=?
The answer is 11. A child who answers 1 probably lost track of the ten.
- 5+6=?
The answer is 11. A child who answers 5 probably answered with one of the numbers shown.
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.