Worksheet

Perimeter Missing Side

Grade 3 - Math - Challenge Me

NameDate

  1. Perimeter detective: total perimeter is 59. Known sides are 17, 18, 15. What is the missing side?

  2. Which equation finds the missing side when perimeter is 44 and known sides are 15, 10, 11?

    • 15 + 10 + 11
    • 44 - (15 + 10 + 11)
    • 44 - 8
    • 44 + 15

  3. Perimeter detective: total perimeter is 31. Known sides are 10, 8, 9. What is the missing side?

  4. Which equation finds the missing side when perimeter is 37 and known sides are 10, 11, 13?

    • 37 + 10
    • 10 + 11 + 13
    • 37 - (10 + 11 + 13)
    • 37 - 3

  5. Perimeter detective: total perimeter is 67. Known sides are 18, 15, 18. What is the missing side?

  6. Which equation finds the missing side when perimeter is 40 and known sides are 9, 7, 14?

    • 40 + 9
    • 40 - (9 + 7 + 14)
    • 9 + 7 + 14
    • 40 - 10

  7. Perimeter detective: total perimeter is 25. Known sides are 3, 7, 4. What is the missing side?

  8. Which equation finds the missing side when perimeter is 51 and known sides are 15, 3, 15?

    • 15 + 3 + 15
    • 51 - (15 + 3 + 15)
    • 51 - 18
    • 51 + 15

  9. Perimeter detective: total perimeter is 51. Known sides are 11, 18, 9. What is the missing side?

  10. Which equation finds the missing side when perimeter is 42 and known sides are 3, 13, 13?

    • 3 + 13 + 13
    • 42 - (3 + 13 + 13)
    • 42 + 3
    • 42 - 13
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