New
New
Year 5

# Explain how to calculate the area of a rectangle using multiplication

I can explain how to use multiplication to calculate the area of a rectangle.

New
New
Year 5

# Explain how to calculate the area of a rectangle using multiplication

I can explain how to use multiplication to calculate the area of a rectangle.

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## Lesson details

### Key learning points

1. The area of a rectangle is similar to an array for multiplication.
2. Times table knowledge helps you to calculate the area of a rectangle.
3. To find the area of a rectangle you multiply the length by the width.

### Common misconception

Some pupils may still not have the automaticity of times tables facts useful for this lesson.

Pre-teaching some tricky times tables facts by using counters for arrays will be useful. Consider allowing scaffolds within the lesson.

### Keywords

• Array - Items (including numbers) arranged in columns or rows are called arrays.

• Length - Length is the distance from one point to another.

• Width - Width is the distance from side to side.

One of the slides shows a teacher using a piece of paper, cut to size, hiding all of the squares on an array apart from the length and the width. Regular practice outside of the lesson using different arrays will help to reinforce the learning.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
9 × 8 = .
Q2.
Match the array with times tables facts.
Correct Answer:4 × 3 = 12,a

a

Correct Answer:5 × 4 = 20,b

b

Correct Answer:2 x 8 = 16,c

c

Correct Answer:3 x 3 = 9,d

d

Q3.
Which times table fact is being shown here?
Correct answer: 3 x 5 = 15
Correct answer: 5 x 3 = 15
3 + 5 = 15
Q4.
True or false? This shape has an area of three square metres.
Correct answer: False. The shapes meet at the vertices so they are three shapes.
True. There are 3 squares that each have the area of one square metre.
Q5.
Which of these statements are true for a square?
Correct answer: All of the sides are of equal length
Correct answer: All of the angles are equal
All of the angles are 180 degrees
Correct answer: It is a kind of rectangle
None of the sides are parallel
Q6.
Match each parts of the rectangle to the correct letter.

a

b

c

## Exit quiz

### 6 Questions

Q1.
Which of these rectangles has the dimensions correctly labelled ?
b
Q2.
What is the area of this shape? cm²
Correct Answer: 12 , 12 cm², 12 square centimetres, 12 centimetres squared, twelve
Q3.
What is the area of this shape? cm²
Correct Answer: 15, 15 cm², 15 centimetres squared, 15 square centimetres
Q4.
What is the area of the shaded shape? cm²
Correct Answer: 16, 16 cm², 16 square centimetres, 16 centimetres squared, sixteen
Q5.
What is the area of this shape? cm²
Correct Answer: 28, 28 cm², 28 square centimetres, 28 centimetres squared, twenty eight
Q6.
Order the shapes by area, starting with the smallest area.
1 - a
2 - d
3 - c
4 - b