Find the missing side of a rectangle
Divide the area by the side you know.
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See worked examples
A rectangular poster has an area of 49 square decimetres. It is 7 dm long. How wide is it?
Answer: 7 dm
A rectangular garden is 4 m long and 4 m wide. What is its area?
Answer: 16 square metres
A rectangular patio has an area of 18 square metres. It is 3 m long. How wide is it?
Answer: 6 m
Tip: Divide the area by the side you know.
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Curriculum
Common Core: 4.MD.A.3
Print a free worksheet with answers (20 questions).
On paper: this skill is in the printable pack Grade 4 Time and Measurement Word Problems (Common Core), with an answer key.
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- Fence It, Fill It: Area and Perimeter Grades 3–4 · printable lessons
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