Add and subtract two numbers that bridge through 10 | Maths

Starter quiz

What expression does this image show? 7 + ______

'5' ✓
This image shows 6 + 8. How should the 8 be partitioned?

Partition 8 into 6 and 2

Partition 8 into 4 and 4 ✓

Partition 8 into 5 and 3
Look at this inequality. 2 + 4 + 6 ______ 10 Which symbol is missing? < > or =

<

> ✓

=
Which representation shows 6 + 7?
How can 5 be partitioned to help make 10?

Partition 5 into 1 and 4

Partition 5 into 2 and 3 ✓

Partition 5 into 5 and 0
Partition 5 in this equation to find the sum. 8 + 5 = ______

'12' ✓

Exit quiz

Andeep has the equation 9 + 6 = ___ How has he partitioned 6 to be able to bridge through 10?

6 was partitioned into 1 and 5 ✓

6 was partitioned into 3 and 3

6 was partitioned into 10 and 5
7 + 5 = 12 How has Laura shown bridging through 10?

7 + 10 + 12

7 + 5

7 + 3 + 2 ✓
When solving 7 + 4 = ? which expression shows that the second addend has been partitioned correctly to bridge 10?

7 + 1 + 3

7 + 3 + 1 ✓

7 + 2 + 2
How should 5 be partitioned in each expression to bridge through 10?

6 + 5

⇔

4 + 1 ✓

7 + 5

⇔

3 + 2 ✓

8 + 5

⇔

2 + 3 ✓

9 + 5

⇔

1 + 4 ✓
How should 5 be partitioned to bridge 10?

Partition 5 into 1 and 4

Partition 5 into 2 and 3

Partition 5 into 3 and 2 ✓

Partition 5 into 4 and 1
14 − 6 = 8 How would the 6 have been partitioned to bridge 10?

6 was partitioned into 5 and 1

6 was partitioned into 4 and 2 ✓

6 was partitioned into 3 and 3

Worksheet

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Lesson Details

Key learning points

Partition the addend so that you can make a number pair to 10
The remaining part can be added to 10
Partition the part being subtracted so that one of its smaller parts is equal to the ones digit.
The remaining part can be subtracted from 10
Bridging through 10 can be represented on a number line.

Common misconception

Children may make mistakes when adopting more mental strategies.

Leave scaffolds in place until showing confidence in verbal explanation. For example, once confident visualising 'making 10' using the ten frame, remove the scaffold of the ten frame and counters.

Keywords

Partition - The act of splitting an object or value down into smaller parts.
Whole - All of a group or number.
Part - A piece or section of the whole.
Bridging 10 - Addition or subtraction that crosses the 10 boundary.