New
New
Year 3

# Measure the mass of objects using grams

I can measure the mass of objects using grams.

New
New
Year 3

# Measure the mass of objects using grams

I can measure the mass of objects using grams.

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## Lesson details

### Key learning points

1. Scales can be used to measure the mass of objects.
2. Scales are marked in different ways.
3. Counting in 10s, 20s, 50s and 25s helps to read scales.
4. Knowing the composition of 100 helps to determine the value of the unmarked intervals.

### Common misconception

Misreading of scales by counting marks rather than equal parts in between the marked intervals.

Remember to look at the number of equal parts in between the marked intervals then use your knowledge of the composition of 100.

### Keywords

• Mass - Mass is a measure of how much matter something contains. It is measured by how much something weighs. Mass can be measured in grams.

• Gram - A gram is a metric measure of mass. A paper clip has a mass of about 1 gram. The abbreviation is g.

Practical lesson where possible where children can practice measuring the mass of objects using scales. Use scales where children need to count up in 10s, 20s, 25s or 50s.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
Look at this sequence of numbers. What number would come next?
Correct Answer: 80, eighty, Eighty
Q2.
Match the phrase to the appropriate number to finish this sentence in different ways. One hundred is composed of { }
Correct Answer:two equal parts of ,50

50

Correct Answer:four equal parts of,25

25

Correct Answer:five equal parts of,20

20

Correct Answer:ten equal parts of,10

10

Q3.
Look at the number line. Label the missing number.
Q4.
Look at the scales. Which number is missing from where the arrow is pointing to?
Correct Answer: 400, 400 g, 400g
Q5.
Look at the scales. Which scale is showing the greater mass?
A
They are both showing the same mass.
Q6.
Starting with the smallest mass, put these scales in order of the mass they are showing.
1 - C
2 - B
3 - A

## Exit quiz

### 6 Questions

Q1.
By reading the scale, work out the mass of this toy car.
100 g
110 g
120 g
Correct answer: 150 g
Q2.
Look at the scales. Which scale is showing the greater mass?
B
Both scales are showing the same mass.
Q3.
Looks at the scales. Which scale is showing the smaller mass?
A
B
Correct answer: Both scales are showing the same mass.
Q4.
Starting with the lightest, put these scales in the order of the mass they are showing.
1 - B
2 - C
3 - A
Q5.
Andeep found a tomato that has a mass of 110 g. Sophia’s tomato has a mass that is 50 g more. Which scale shows the mass of Sophia’s tomato?
A
C
Q6.
Andeep has a birthday cake with a mass of 540 g. He gives a slice of cake with a mass of 100 g to both Sophia and Izzy. He then eats an 60 g slice. Which scale shows the mass of cake that is left?