Finding a missing side
Grade 4 · Level 2 · Sheet 1the answers
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- 1.Answer:
A rectangle has an area of 54. One side is 6. How long is the other side?
- 2.Answer:
A rectangle has an area of 42. One side is 6. How long is the other side?
- 3.Answer:
A rectangle has an area of 40. One side is 10. How long is the other side?
- 4.Answer:
A rectangle has an area of 12. One side is 3. How long is the other side?
- 5.Answer:
A rectangle has an area of 30. One side is 6. How long is the other side?
- 6.Answer:
A rectangle has an area of 40. One side is 5. How long is the other side?
- 7.Answer:
A rectangle has an area of 21. One side is 3. How long is the other side?
- 8.Answer:
A rectangle has an area of 32. One side is 8. How long is the other side?
- 9.Answer:
A rectangle has an area of 12. One side is 4. How long is the other side?
- 10.Answer:
A rectangle has an area of 56. One side is 8. How long is the other side?
- 11.Answer:
A rectangle has an area of 60. One side is 10. How long is the other side?
- 12.Answer:
A rectangle has an area of 72. One side is 9. How long is the other side?
Show the answer key
- 1.9
- 2.7
- 3.4
- 4.4
- 5.5
- 6.8
- 7.7
- 8.4
- 9.3
- 10.7
- 11.6
- 12.8
Answer key · Finding a missing side · Level 2 · Sheet 1
- 1.9
- 2.7
- 3.4
- 4.4
- 5.5
- 6.8
- 7.7
- 8.4
- 9.3
- 10.7
- 11.6
- 12.8
The mistakes behind most wrong answers
A wrong answer in finding a missing side 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.
A rectangle has an area of 80. One side is 10. How long is the other side?
The answer is 8. A child who answers 800 probably multiplied instead of dividing.
A rectangle has an area of 12. One side is 4. How long is the other side?
The answer is 3. A child who answers 8 probably took away instead of adding.
A rectangle has an area of 50. One side is 10. How long is the other side?
The answer is 5. A child who answers 10 probably answered with one of the numbers shown.
A rectangle has an area of 6. One side is 3. How long is the other side?
The answer is 2. A child who answers 1 probably counted one too many or too few.
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.