Comparing Lengths

Test yourself

Comparing and Ordering Lengths

You can use your knowledge of units of length to work out which things are longer or taller or to put them in order.

Comparing pencils

Some children measure their pencils using different units:
- Amy says hers is 90 mm.
- Sam says his is 12 cm.
Who has the longest pencil?

Answer

To compare the lengths of the pencils, we have to write them in the same units:
- 12cm = 120mm, as there are 10 mm in every cm.
- 90mm = 9cm
So Sam’s pencil is longer than Amy’s.

Comparing plants

The class measure some bean plants in the vegetable garden:
- Plant A is 150cm.
- Plant B is 1m 20cm.
- Plant C is 80cm.
Order the plants' height from smallest to largest.

Answer

Plant B has a height of 120 cm as there are 100 cm in every 1 m.
Their height order from smallest to largest is:
- C (80cm), B (1m 20cm), A (150cm).

1Year 3 - Number

2Year 3 - Measurement

2.1Length

2.1.1Length

2.1.2Comparing Lengths

2.1.3Add & Subtract Lengths

2.1.4Perimeter

2.2Mass

2.2.1Mass

2.2.2Comparing Masses

2.2.3Add & Subtract Masses

2.3Volume & Capacity

2.3.1Volume & Capacity

2.3.2Comparing Volumes

2.3.3Add & Subtract Volumes

2.4Money

2.4.1Money

2.4.2Counting Money

2.4.3Adding & Subtracting Money

2.5Time

2.5.1Units of Time

2.5.2Clocks

2.5.3Telling the Time

2.5.4Time of the Day

2.5.512-Hour & 24-Hour Clocks

2.5.6Measuring Time

3Year 3 - Geometry

3.1Angles

3.1.1Angles in Degrees

3.1.2Types of Angle

3.2Properties of Shapes

3.2.12D Shapes

3.2.23D Shapes

3.3Straight Lines

3.3.1Straight Lines

3.3.2Parallel & Perpendicular Lines

4Year 3 - Statistics

4.1Statistics

4.1.1Statistics

4.1.2Pictograms & Bar Charts

5Year 4 - Number

6Year 4 - Measurement

6.1Units

6.1.1Metric Measurements

6.1.2Adding & Subtracting Money

6.2Time

6.2.1Converting Units of Time

6.2.2Changing the 12-Hour Clock to the 24-Hour Clock

6.2.3Changing the 24-hour Clock to the 12-Hour Clock

7Year 4 - Geometry

7.1Properties of Shapes

7.1.1Symmetry

7.1.2Types of Triangle

7.1.3Quadrilaterals

7.2Perimeter & Area

7.2.1Perimeter

7.2.2Area

7.3Position & Direction

7.3.1Coordinates

7.3.2Translation

8Year 4 - Statistics

8.1Statistics

8.1.1Types of Data

8.1.2Pictograms & Bar Charts

8.1.3Line Graphs

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