Mass

We use the word mass to describe the measurement of how heavy something is. Metric measurements of mass are based on the unit of measurement called the gram.

Units of measurement

Gram and kilogram are units of mass.
We write the units after the number, using lower case letters.
- 5 g (five grams).
- 20 kg (twenty kilograms).

Relations between units

Grams are smaller and kilograms are bigger.
There are 1,000 grams in 1 kilogram.
You should use grams to measure light objects.
You should use kilograms to measure heavy objects.

Weighing objects

We use a scale to weigh different objects.
Some scales have a dial with measurements written in kilograms or grams.
- Scales often have divisions between the main numbers.
Divisions between the kilograms might be 100s of grams or fractions of a kilogram, like a half or a quarter.

Mixed units

You can weigh objects and use a mixture of kg and g.
For example, 2 kg 300 g is a mass measured in a mixture of kg and g.

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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