Area of a rectangle
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. A rectangle is 5 cm long and 4 cm wide. What is its area (in square cm)?
2. A rectangle is 6 cm long and 5 cm wide. What is its area (in square cm)?
3. A rectangle is 6 cm long and 4 cm wide. What is its area (in square cm)?
4. A rectangle is 4 cm long and 3 cm wide. What is its area (in square cm)?
5. A rectangle is 5 cm long and 3 cm wide. What is its area (in square cm)?
Answer key · Area of a rectangle
1. 20
Area fills the rectangle with unit squares: 5 rows of 4.
A = 5 × 4 = 20 square cm.
2. 30
Area fills the rectangle with unit squares: 6 rows of 5.
A = 6 × 5 = 30 square cm.
3. 24
Area fills the rectangle with unit squares: 6 rows of 4.
A = 6 × 4 = 24 square cm.
4. 12
Area fills the rectangle with unit squares: 4 rows of 3.
A = 4 × 3 = 12 square cm.
5. 15
Area fills the rectangle with unit squares: 5 rows of 3.
A = 5 × 3 = 15 square cm.
Try it together
Choose three objects at home. Estimate their measurements, then check together and explain the differences.