New
New
Year 3

# Solve problems involving mass

I can solve problems involving mass.

New
New
Year 3

# Solve problems involving mass

I can solve problems involving mass.

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## Lesson details

### Key learning points

1. Visualising a word problem helps us see the mathematics.
2. Word problems can be represented as a bar model by identifying the parts and the whole.
3. The bar model helps us to understand the structure of the maths and to form a calculation to help solve the problem.
4. Number facts can be used when solving problems involving mass.

### Common misconception

Children may misidentify the parts or wholes in a problem.

Children should be encouraged to visualise the problem (eg. act it out or draw it) to help them identify the parts and whole.

### Keywords

• Bar model - A bar model is a pictorial representation of a problem where bars are used to represent the known and unknown quantities.

• Whole - The whole is all of something. It is complete.

• Part - A part is some but not all of something. It is an amount or section which, when combined with others, makes up the whole.

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

Ensure that children are encouraged to visualise the maths and give them opportunity to talk about how they see the problem. Resources should be readily available for children to use such as a number line.
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 the picture of the apple before and after it had been partly eaten. At which point did it have the greatest mass?
Correct answer: When it was whole.
When it was partly eaten.
Q2.
Look at this bar model. What does the 600 g represent?
Correct answer: The 600 g represents the whole.
The 600 g represents a part of the whole.
Q3.
Match the multiple of ten to the number of tens that it is composed from.

4 tens

45 tens

10 tens

11 tens

31 tens

Q4.
Match each whole number to the number that is half of it.

10

30

50

130

320

Q5.
Match each calculation to its answer.
Correct Answer:2 x 5 = ,10

10

Correct Answer:4 x 5 = ,20

20

Correct Answer:5 x 8 = ,40

40

Correct Answer:10 x 5 = ,50

50

Correct Answer:5 x 12 = ,60

60

Q6.
What mass is this scale showing?
202 g
240 g
250 g

## Exit quiz

### 6 Questions

Q1.
Look at the problem and bar models. Which bar model is an accurate representation of the problem?
A
Q2.
Look at the bar model. Calculate how much heavier Sophia's whole cake is than Jacob's slice.
440 g
Q3.
10 identical pebbles have a mass of 80 g. What is the mass of one pebble?
Correct Answer: 8 g, 8g, 8
Q4.
Look at the bar model. The mass of a conker is half the mass of the 10 pebbles. What is the mass of the conker?
Correct Answer: 40 g, 40g, 40
Q5.
Look at the bar model. How much greater is the mass of the 40 g conker than the mass of an 8 g pebble?