Worksheet

Addition Within 20 Error Detective

Grade 1 - Math - Building Confidence

NameDate

  1. Addition detective: a student wrote 4 + 6 = 11. Is it correct?

    • no
    • maybe
    • not enough information

  2. Fix the addition mistake: 4 + 2 should equal ____ instead of 5.

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

  4. Addition detective: a student wrote 2 + 5 = 6. Is it correct?

    • maybe
    • not enough information
    • no

  5. Fix the addition mistake: 5 + 3 should equal ____ instead of 9.

  6. Fix the addition mistake: 4 + 6 should equal ____ instead of 9.

  7. Addition detective: a student wrote 6 + 5 = 12. Is it correct?

    • not enough information
    • maybe
    • no

  8. Fix the addition mistake: 6 + 3 should equal ____ instead of 8.

  9. Fix the addition mistake: 7 + 4 should equal ____ instead of 12.

  10. Addition detective: a student wrote 4 + 3 = 6. Is it correct?

    • no
    • maybe
    • not enough information
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