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Maths · Grade 3 · Set C
Round and round: harder shapes
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C
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Goal: 15 min
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Remember: Add every side to find the perimeter. Work back from the perimeter to find a missing side. Shapes with the same area can have different perimeters.

Find the way round

1
A pool is 15 meters long and 8 meters wide. How many meters all the way round?
2
A square sign has sides of 12 inches. How many inches all the way round?
3
All the way round the triangle is 21 cm. Two sides are labeled. How long is the third side?
4
Each square is 1 inch. How many inches all the way round the staircase?
5
Each square is 1 meter. How many meters all the way round the L shaped deck?
6
The perimeter of the rectangle is 24 units. One side is 8 units. How long is the side next to it?

Same area, same way round?

7
Which rectangle has a perimeter of 16 units?
A
B
C
8
A 1 by 8 strip of squares and a 2 by 4 rectangle both hold 8 squares. How many more units go round the strip?
9
Both shapes have the same perimeter.
TrueFalse
10
Which also finds the perimeter of this rectangle?
9 × 52 × 9 + 2 × 59 + 5
11
A garden is 14 m long and 6 m wide. A fence goes all the way round it, but a gate 2 m wide has no fence. How many meters of fence?
12
Draw two different rectangles that each have a perimeter of 12 units.
13
Both shapes hold 9 squares. Write how you know the 1 by 9 strip has the longer way round.
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Answer key · Set C
Round and round: harder shapes
146 15 + 8 + 15 + 8 = 46 meters.
248 A square has 4 equal sides. 12 + 12 + 12 + 12 = 48.
36 6 + 9 = 15 so far. 21 - 15 = 6 cm.
416 The steps go across 4 and down 4, and the other two sides are 4 and 4. 4 + 4 + 4 + 4 = 16.
526 Go round once: 7 + 3 + 3 + 3 + 4 + 6 = 26 meters.
64 Two sides of 8 make 16. 24 - 16 = 8 for the other two sides, so each is 4.
7C 3 + 5 + 3 + 5 = 16. A is 12 round and B is 18 round.
86 The strip is 18 round and the rectangle is 12 round. 18 - 12 = 6.
9True The rectangle is 7 + 3 + 7 + 3 = 20 round. The square is 5 + 5 + 5 + 5 = 20.
102 × 9 + 2 × 5 There are two sides of 9 and two sides of 5.
1138 All the way round is 14 + 6 + 14 + 6 = 40. Take away the gate: 40 - 2 = 38.
13Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.