Mathematics · Grades 3–6
Find a missing rectangle side
Use consistent length and area units.
The key idea
Use consistent length and area units.
width = area ÷ length
Worked examples
A rectangle has area 648 cm² and length 27 cm. Find its width in cm.
648 ÷ 27 = 24
24 cm
A rectangle has area 216 cm² and length 12 cm. Find its width in cm.
216 ÷ 12 = 18
18 cm
Try it yourself
A rectangle has area 209 cm² and length 11 cm. Find its width in cm.
A rectangle has area 350 cm² and length 25 cm. Find its width in cm.
Check your understanding
Answers and marking notes
- 19 cm
209 ÷ 11 = 19
- 14 cm
350 ÷ 25 = 14
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.