Worksheet

Perimeter Missing Side

Grade 3 - Math - Building Confidence

NameDate

  1. Perimeter detective: total perimeter is 17. Known sides are 5, 4, 5. What is the missing side?

  2. Which equation finds the missing side when perimeter is 22 and known sides are 7, 4, 7?

    • 22 - 4
    • 7 + 4 + 7
    • 22 - (7 + 4 + 7)

  3. Perimeter detective: total perimeter is 17. Known sides are 4, 5, 4. What is the missing side?

  4. Which equation finds the missing side when perimeter is 17 and known sides are 5, 3, 4?

    • 5 + 3 + 4
    • 17 - (5 + 3 + 4)
    • 17 - 5

  5. Perimeter detective: total perimeter is 19. Known sides are 6, 5, 4. What is the missing side?

  6. Which equation finds the missing side when perimeter is 21 and known sides are 5, 6, 7?

    • 21 - (5 + 6 + 7)
    • 21 - 3
    • 5 + 6 + 7

  7. Perimeter detective: total perimeter is 19. Known sides are 6, 5, 5. What is the missing side?

  8. Which equation finds the missing side when perimeter is 17 and known sides are 7, 3, 4?

    • 17 - (7 + 3 + 4)
    • 7 + 3 + 4
    • 17 - 3

  9. Perimeter detective: total perimeter is 18. Known sides are 5, 5, 4. What is the missing side?

  10. Which equation finds the missing side when perimeter is 17 and known sides are 5, 4, 5?

    • 5 + 4 + 5
    • 17 - (5 + 4 + 5)
    • 17 - 3
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