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Measuring Classroom Object Perimeters
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Measuring Classroom Object Perimeters
Perimeter is the total distance around the outside edge of a shape. Add the side lengths, keeping the units the same. For measuring tasks, use a ruler or tape and record your own results.
Warm-up: spot the perimeter
Imagine you are helping plan a new classroom display. Start by checking your perimeter skills.
1.Which statement best explains perimeter?
- The amount of space inside a shape
- The distance all the way around the outside of a shape
- The distance from the middle to the edge
2.A square table mat has sides of 35 cm. Calculate its perimeter. Show the addition you used.
3.A rectangular book cover is 28 cm long and 19 cm wide. What is its perimeter? Include the unit.
Measure and record
Measure real objects with a ruler or tape. Answers will vary, so check that your four sides add to your recorded perimeter.
4.Choose a rectangular object you can safely measure, such as a book or pencil case. Write its name, length and width in centimetres, then calculate its perimeter.
5.A noticeboard is 120 cm long and 75 cm high. A ribbon will go all the way around its edge. How many centimetres of ribbon are needed?
6.A classroom display is made from two rectangles joined side by side: one is 80 cm by 60 cm and the other is 40 cm by 60 cm. The joined 60 cm edges are inside the display. Find the outside perimeter of the whole display.
7.True or false: If every side of a rectangle is doubled, its perimeter is doubled too. Explain briefly.
8.A rectangular rug has a perimeter of 260 cm. Its length is 80 cm. What is its width? Show how you know.
9.Draw an L-shaped outline using straight sides. Label every side length in centimetres, then add the outside sides to find its perimeter. Make sure your side lengths fit together.
10.Tui says, “A rectangle that is 9 cm by 4 cm has a perimeter of 13 cm.” Explain the mistake and give the correct perimeter.
2 printable pages
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