Worksheet

Addition Within 20 Error Detective

Grade 1 - Math - Challenge Me

NameDate

  1. Addition detective: a student wrote 4 + 16 = 19. Is it correct?

    • no
    • maybe
    • not enough information
    • yes

  2. Fix the addition mistake: 12 + 6 should equal ____ instead of 17.

  3. Fix the addition mistake: 14 + 5 should equal ____ instead of 20.

  4. Addition detective: a student wrote 5 + 9 = 13. Is it correct?

    • not enough information
    • yes
    • maybe
    • no

  5. Fix the addition mistake: 8 + 10 should equal ____ instead of 19.

  6. Fix the addition mistake: 17 + 3 should equal ____ instead of 19.

  7. Addition detective: a student wrote 17 + 2 = 20. Is it correct?

    • not enough information
    • no
    • maybe
    • yes

  8. Fix the addition mistake: 8 + 6 should equal ____ instead of 13.

  9. Fix the addition mistake: 16 + 4 should equal ____ instead of 19.

  10. Addition detective: a student wrote 12 + 4 = 15. Is it correct?

    • no
    • maybe
    • yes
    • not enough information
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