AC9M4M02Year 4MeasurementPractised on site

AC9M4M02 — Year 4 Measurement

Official Curriculum Content Description:

recognise ways of measuring and approximating the perimeter and area of shapes and enclosed spaces, using appropriate formal and informal units

Worked Examples (2)

Example 1Area by Counting Unit Squares

A floor is covered with square tiles in

2

rows, with

2

tiles in each row. How many square tiles cover the floor?

Common mistake: Added the rows and the columns instead of counting squares.

Correct Answer:

4

Worked Solution:

1. Each row holds

2

squares and there are

2

rows. 2. Count the squares by rows:

2 \times 2 = 4

\text{Area} = 4

squares.

Example 2Perimeter of Rectangles & Composite Shapes

A rectangle is

1

cm by

20

cm. What is its perimeter?

Common mistake: Added length and width once, instead of doubling for all four sides.

Correct Answer:

42\text{ cm}

Accepted: A unit is optional (cm accepted).

Worked Solution:

Perimeter

= 2 \times (\text{length} + \text{width}) = 2 \times (1 + 20) = 2 \times 21 = 42\text{ cm}

Work through unlimited interactive questions for this curriculum skill, with instant answers and step-by-step methods.