Tuesday, 24th August 2021 – Numeracy

Area

I am learning to work out the area of a 2D shape.

I know I can do it when I can follow a formula to work out the area of a 2D shape.

Watch

Monster Measure

Area measures surface, it’s a two dimensional measure. Grumble has measured a page from his exercise book, can you help Grumble work out the area of his page?

Remember the formula:

Area = Length × Width

Now Try Your Own

Get a ruler or tape measure, measure the area of your page.

You will need to measure the length and the width.

Multiply the length by the width in centimetres.

What is the area of you page?

Write your answer and show your working out.

Search Your Home

Search your home for more objects to measure, find 5 different objects and measure the area, remember to follow the formula length times width, if your object is very big, you might need a calculator to help you. Record your findings in a table like the one below, the first one is done for you:

Monday, 23rd August 2021 – Numeracy

Area

I am learning to work out the area of a 2D shape.

I know I can do it when I can follow a formula to work out the area of a 2D shape.

Watch

What is Area?

Area is the amount of space taken up by the total surface of a shape. To find the area of a shape, we need to know exactly how many square units will fit inside it. Here are two ways to do this.

1. Count the Squares

The first is to count how many squares will fit into the shape, like this:

Did you notice? Even when the shape changed, the total number of square units was the same for the rectangle. All these shapes have an area of six square units.

2. Use a Formula

Counting squares can work well for small, simple shapes but it gets tricky if the shape is very large or more complex. Using formulas, we can quickly find the area of rectangles.

Rectangles

The formula for the area of a rectangle is length multiplied by width.

• Area = Length × Width
• Area = 5 × 10
• Area = 50 cm²

Units

When you are calculating area, your measurements should be in the same units. If you measured in centimeters, for example, then your answer will be written in centimeters squared (centimeters multiplied by centimeters) .

Can you work out the area of the following shapes, the first one is done for you.