Worksheet

Addition Within 20 Error Detective

Grade 1 - Math - On Level

NameDate

  1. Addition detective: a student wrote 7 + 10 = 18. Is it correct?

    • not enough information
    • yes
    • no
    • maybe

  2. Fix the addition mistake: 9 + 4 should equal ____ instead of 12.

  3. Fix the addition mistake: 15 + 3 should equal ____ instead of 19.

  4. Addition detective: a student wrote 12 + 3 = 14. Is it correct?

    • maybe
    • no
    • yes
    • not enough information

  5. Fix the addition mistake: 2 + 11 should equal ____ instead of 14.

  6. Fix the addition mistake: 2 + 14 should equal ____ instead of 15.

  7. Addition detective: a student wrote 6 + 2 = 9. Is it correct?

    • yes
    • no
    • not enough information
    • maybe

  8. Fix the addition mistake: 14 + 2 should equal ____ instead of 15.

  9. Fix the addition mistake: 11 + 2 should equal ____ instead of 14.

  10. Addition detective: a student wrote 8 + 6 = 13. Is it correct?

    • not enough information
    • yes
    • maybe
    • no
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