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Area and perimeter rules: 4th grade math

Area and perimeter formulas for rectangles. A free 4th grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.

Lesson plan

Goal

  • Students can do this: area and perimeter formulas for rectangles.

Teach (10 min)

  • Take away the sides you know from the perimeter.
  • What's left is shared by the two matching sides.
  • Work one example on the board while students say each step aloud, then do one together.

Practise (15 min)

  • Students work the printable sheet in pairs, then alone.
  • Or practise it as a game with no sign-up: https://peabody.kids/math/whole.perim?lesson=4-missing-side&at=4

Exit ticket (5 min)

  • Use the first three questions on the printable sheet as a slip.

Printable sheet

Name: ____________________   Date: ____________

Area and perimeter rules (4th grade)

  1. The perimeter is 38 feet. How long is the side marked ? ?
    ?9 feet?9 feet
  2. The perimeter is 42 feet. How long is the side marked ? ?
    ?9 feet?9 feet
  3. The perimeter is 18 feet. How long is the side marked ? ?
    ?3 feet?3 feet
  4. The perimeter is 26 centimeters. How long is the side marked ? ?
    ?4 centimeters?4 centimeters
  5. The perimeter is 28 meters. How long is the side marked ? ?
    ?2 meters?2 meters
  6. The perimeter is 28 inches. How long is the side marked ? ?
    ?2 inches?2 inches
  7. The perimeter is 26 meters. How long is the side marked ? ?
    ?2 meters?2 meters
  8. The perimeter is 40 centimeters. How long is the side marked ? ?
    ?6 centimeters?6 centimeters
  9. The perimeter is 18 centimeters. How long is the side marked ? ?
    ?5 centimeters?5 centimeters
  10. The perimeter is 44 feet. How long is the side marked ? ?
    ?7 feet?7 feet
  11. The perimeter is 18 centimeters. How long is the side marked ? ?
    ?6 centimeters?6 centimeters
  12. The perimeter is 18 feet. How long is the side marked ? ?
    ?5 feet?5 feet
Key
  1. 10
  2. 12
  3. 6
  4. 9
  5. 12
  6. 12
  7. 11
  8. 14
  9. 4
  10. 15
  11. 3
  12. 4

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