# Choose efficient approaches when subtracting mixed numbers

I can choose efficient approaches when subtracting mixed numbers.

# Choose efficient approaches when subtracting mixed numbers

I can choose efficient approaches when subtracting mixed numbers.

## Lesson details

### Key learning points

- Partitioning is a strategy that can be used to subtract mixed numbers.
- When partitioning, the whole number part and the fractional part of the minuend must be greater than the subtrahend's.
- Using number-sense can support us to determine the most efficient method to use when subtracting from mixed numbers.

### Common misconception

When partitioning to subtract, children may partition correctly but then may subtract incorrectly by swapping the order of the fractional parts being subtracted.

Is partitioning efficient for this subtraction where the fractional part of the subtrahend is greater than that of the minuend? It may be more efficient to 'find the difference' by counting on.

### Keywords

Mixed number - A mixed number is a whole number and a fraction combined.

Minuend - The minuend is the first number in a subtraction. The number from which another number is to be subtracted.

Subtrahend - The subtrahend is the number that is to be subtracted. The second number in a subtraction.

### 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).

## Video

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## Starter quiz

### 6 Questions

$$2{{4} \over {6}}$$ -

$$ {16} \over {6}$$

$$3{{4} \over {7}}$$ -

$$ {25} \over {7}$$

$$1{{6} \over {7}}$$ -

$$ {13} \over {7}$$

$$2{{1} \over {6}}$$ -

$$ {13} \over {6}$$

$$5{{3} \over {7}}$$ -

$$ {38} \over {7}$$

$$ {10} \over {6}$$ -

$$1{{4} \over {6}}$$

$$ {19} \over {6}$$ -

$$3{{1} \over {6}}$$

$$ {32} \over {6}$$ -

$$5{{2} \over {6}}$$

$$ {35} \over {6}$$ -

$$5{{5} \over {6}}$$

$$ {41} \over {6}$$ -

$$6{{5} \over {6}}$$