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Converting Between Metric and Imperial Units by Rounding

In this worksheet, students use rounding to gain approximate conversions between metric and imperial units.

'Converting Between Metric and Imperial Units by Rounding' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Round/Approximate Numbers Appropriately

Difficulty level:  

Worksheet Overview

In this worksheet, we will use rounding to convert between imperial and metric units.

Imperial units can be converted into approximate metric equivalents by knowing the following conversions:

1 m = 3 ft
8 km = 5 miles
1 kg = 2.2 lbs
30 g = 1 ounce
1 litre = 2 pints


Example 1

Approximately how many metres are equivalent to 30 ft ?

1 m = 3 ft
1/3 m = 1 ft
30 × 1/3 m = 30 ft
10 m = 30 ft

Example 2

Approximately how many km are equivalent to 17 miles ?

8 km = 5 miles
8/5 km = 1 mile
17 × 8/5 km = 17 miles
27.2 km = 17 miles

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