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Area of rectangles in square units.

Relate a rectangular array to counting unit squares.

Numihana · England Year 4

Area of rectangles in square units

Practice sheet

Name: ______________
Date: ______________

Relate a rectangular array to counting unit squares.

1

Find the area. Base: 8 cm; perpendicular height: 9 cm.

8 × 9 cm · diagram not to scale
Answer: ________________
2

Find the area. Base: 3 cm; perpendicular height: 2 cm.

3 × 2 cm · diagram not to scale
Answer: ________________
3

Find the area. Base: 11 cm; perpendicular height: 11 cm.

11 × 11 cm · diagram not to scale
Answer: ________________
4

Find the area. Base: 9 cm; perpendicular height: 10 cm.

9 × 10 cm · diagram not to scale
Answer: ________________
5

Find the area. Base: 2 cm; perpendicular height: 12 cm.

2 × 12 cm · diagram not to scale
Answer: ________________
6

Find the area. Base: 2 cm; perpendicular height: 3 cm.

2 × 3 cm · diagram not to scale
Answer: ________________
Numihana · England Year 4 · Area of rectangles in square units
Numihana · England Year 4

Area of rectangles in square units

Answer key

Name: ______________
Date: ______________

Relate a rectangular array to counting unit squares.

1

Find the area. Base: 8 cm; perpendicular height: 9 cm.

8 × 9 cm · diagram not to scale
Answer: 72 cm²
2

Find the area. Base: 3 cm; perpendicular height: 2 cm.

3 × 2 cm · diagram not to scale
Answer: 6 cm²
3

Find the area. Base: 11 cm; perpendicular height: 11 cm.

11 × 11 cm · diagram not to scale
Answer: 121 cm²
4

Find the area. Base: 9 cm; perpendicular height: 10 cm.

9 × 10 cm · diagram not to scale
Answer: 90 cm²
5

Find the area. Base: 2 cm; perpendicular height: 12 cm.

2 × 12 cm · diagram not to scale
Answer: 24 cm²
6

Find the area. Base: 2 cm; perpendicular height: 3 cm.

2 × 3 cm · diagram not to scale
Answer: 6 cm²
Numihana · England Year 4 · Area of rectangles in square units

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The skill behind this activity

Relate a rectangular array to counting unit squares.

Department for Education: mathematics programmes of study ↗

Year 4 → Measurement · Supports official non-statutory guidance. Pack 2.2.0 · source checked 2026-10-12.

For teachers and parents

Use the labelled perpendicular height. Rectangles and parallelograms use base × height; a triangle uses half that product.

A common slip

A sloping side is not the perpendicular height. Use square units for area.

Curriculum coverage

Worked example

Find the area. Base: 7 cm; perpendicular height: 3 cm.

7 × 3 cm · diagram not to scale
Answer: 21 cm²

Use the labelled perpendicular height. Rectangles and parallelograms use base × height; a triangle uses half that product.