New
New
Year 3

# Use place value knowledge to write addition and subtraction equations

I can use place value knowledge to write addition and subtraction equations.

New
New
Year 3

# Use place value knowledge to write addition and subtraction equations

I can use place value knowledge to write addition and subtraction equations.

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## Lesson details

### Key learning points

1. The language of unitising helps us to use number facts to add and subtract multiples of 10.
2. The language of unitising helps us to use number facts to add and subtract multiples of 100.
3. Place value equipment supports explanation of the addition and subtraction equations.

### Common misconception

Identifying the parts and wholes in a problem or given context.

Use the stem sentences and representations of part-part-whole and bar models to support pupils in identifying the parts and whole.

### Keywords

• Part - A piece or section of the whole.

• Whole - All of a group or number.

• Bar model - A way to represent a problem involving parts and whole.

Make use of manipulatives such as base ten equipment or counters to support the recording of the parts and wholes in stem sentences, bar and part-part-whole models before recording using equations.
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.
Express this representation as a number of tens. tens
Correct Answer: 14, 14 tens, fourteen, fourteen tens
Q2.
Match the number of tens to the correct 3-digit number.

130

180

140

190

100

Q3.
160 = 100 + .
Correct Answer: 60, 6 tens, sixty
Q4.
Which equation would make this statement correct? 140 <
100 and 2 tens
Correct answer: 100 and 7 tens
100 and 1 ten
Q5.
What number is missing from the bar model?
Correct Answer: 140, 100 + 40, one hundred and 40, one hundred and forty
Q6.
Sort the values from largest to smallest.
1 - one hundred and 8 tens
2 - 160
3 - one hundred and 3 tens
4 - 110
5 - one hundred

## Exit quiz

### 6 Questions

Q1.
Complete the sentence. Part + part = .
Q2.
In a bar model, to find the whole we add the .
Q3.
Match the numbers and representations.

100 + 70

Correct Answer:100 and 50,10 tens and 5 tens

10 tens and 5 tens

100 + 30

Correct Answer:160,10 tens and 6 tens

10 tens and 6 tens

Correct Answer:100 and 20,10 tens and 2 tens

10 tens and 2 tens

Q4.
Use this bar model. Which subtraction calculations are correct?
100 - 70 = 170
Correct answer: 170 - 70 = 100
70 - 100 = 170
Correct answer: 170 - 100 = 70
Q5.
How can you calculate the missing part?
100 + 150
100 - 150