Adding up to 20
Grade 1 · Level 4 · 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.
- 1.8+10=?
- 2.8+8=?
- 3.9+2=?
- 4.2+5=?
- 5.10+4=?
- 6.6+7=?
- 7.1+2=?
- 8.9+10=?
- 9.5+2=?
- 10.4+1=?
- 11.2+4=?
- 12.1+1=?
Show the answer key
- 1.18
- 2.16
- 3.11
- 4.7
- 5.14
- 6.13
- 7.3
- 8.19
- 9.7
- 10.5
- 11.6
- 12.2
Answer key · Adding up to 20 · Level 4 · Sheet 1
- 1.18
- 2.16
- 3.11
- 4.7
- 5.14
- 6.13
- 7.3
- 8.19
- 9.7
- 10.5
- 11.6
- 12.2
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.
- 10+2=?
The answer is 12. A child who answers 8 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.
- 7+8=?
The answer is 15. A child who answers 5 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.