Measurement

L.O – To understand the difference between metric and imperial units and be able to confidently convert between them

Metric Units

Length – mm, cm, m, km

Weight – g, kg, tonnes

Volume – mm³, cm³, m³, ml, litres

Learn these common metric conversions;

Imperial Units

Length – inches, feet, yards, miles

Weight – ounces, pounds, stones, tons

Volume – gallons, pints

Learn these common imperial conversions;

Metric – Imperial Conversions

Learn these metric – imperial conversions

Example 1:

Convert 16 inches into cm

• 1 inch = 2.54cm
• We need to convert inches into cm, therefore we need to multiply by 2.54

• 16 x 2.54 = 40.64cm

Example 2:

Convert 76cm into inches

• 1 inch = 2.54cm
• We need to convert cm into inches, therefore we need to divide by 2.54

• 76/2.54 = 29.9 inches

It is important to recognise whether to multiply or divide.

To help with this you can;

• follow the ‘arrows’ method as shown in the examples
• think about whether your answer should be bigger or smaller than the original number

e.g. when converting from inches into cm, we know that inches are larger than cm (because 1inch = 2.54cm), therefore we need to multiply in order to obtain a larger number than we began with.

Example 3:

Convert 10.5 gallons into litres

• 1 gallon = 4.5 litres
• We need to convert gallons into litres, therefore we need to multiply by 4.5

• 5 x 4.5 = 47.25 litres