Grade 4, Measurement and geometry
Perimeter
Find the perimeter of rectangles, squares and regular shapes, or a missing side.
Three levels
One skill, rising difficulty
Each sheet carries one level. The three are the same skill at rising difficulty, each named for what it practises.
- Level 1: Rectangles and squares
- Find the perimeter of each shape.
- Level 2: Regular shapes
- Find the perimeter. All the sides of each shape are the same length.
- Level 3: Find the missing side
- Use the perimeter to find the missing side.
Worked example
How the sheet explains it
The helper printed at the top of each sheet: one solved example and the steps a student follows, before the first question. Every number sentence in it is proven by the same checker as the answer key.
Level 1: Rectangles and squares
- Perimeter is the distance all the way around the shape.
- Add all four sides: 7 + 4 + 7 + 4 = 22 cm.
- Or add the length and the width, then double: 7 + 4 = 11, and 2 × 11 = 22 cm.
Level 2: Regular shapes
A regular pentagon has sides of 7 cm. Perimeter = 35 cm
- A pentagon has 5 sides. In a regular shape all the sides are the same length.
- Add the 5 sides: 7 + 7 + 7 + 7 + 7 = 35 cm.
- Or multiply: 5 × 7 = 35 cm.
Level 3: Find the missing side
- Take away the two sides you know: 28 − 9 − 9 = 10 cm.
- The two missing sides share what is left: 10 ÷ 2 = 5 cm.
- Check: 9 + 5 + 9 + 5 = 28.
Goes with
Reference sheets
One-page helpers a student keeps beside this sheet:
- Perimeter and area
- Formulas to remember
Every reference, facts and support sheet is listed in the worksheet catalogue.
In the BC curriculum
Content standards
The British Columbia content standard this skill is written for, by the codes used across this site:
- bc.math.4.c.14
The wording of each standard is on the Province's mathematics curriculum page.
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