Comparing Masses

Test yourself

Comparing and Ordering Masses

You can use your knowledge of units of mass to work out which things are heavier or lighter or to put them in order.

School bags

Some children weigh their school bags.
- Amy says her bag is 1 kg 400 g.
- Sam says his bag is 980 g.
Which school bag weighs the most?

Answer

To compare the masses of the bags, we have to write them in the same units:
1 kg 400 g = 1,400 g
1,400 g is greater than 980 g, so the mass of Amy’s bag is greater than Sam’s.
Amy’s school bag weighs more than Sam’s.

Flour

The class have used some bags of flour for baking.
They weigh them to find out how much is left in each one.
- Bag A has a mass of 1 kg 700 g.
- Bag B has a mass of 900 g.
- Bag C has a mass of 1,200 g.

Answer

To order the masses, we need to write the mass of bag A in grams:
- 1 kg 700 g = 1,700 g
The order of their masses from lightest to heaviest is B (9,00 g), C (1,200 g), A (1,700 g)
Bag A has the most flour left.

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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