# Numeracy

Subtraction Using Hundreds, Tens and Units

We can subtract numbers

* Horizontally using Partitioning.

467 - 151 =

467 - 100 - 50 - 1 = 316         REMEMBER When subtracting

keep it simple! Only partition

the amount that you take away.

Try these Spicy   674 - 251 =               Medium   74 - 51 =

596 - 234 =                          96 - 34 =

867 - 346 =                          67 - 46 =

972 - 262 =                          72 - 62 =

459 - 137 =                           59 - 37 =

868 - 431 =                           68 - 31 =

358 - 216 =                           58 - 16 =

785 - 423 =                           85 - 23 =

________________________________________________

* Vertically

H T U

4 6 7               REMEMBER  *Organise columns carefully.

- 1 5 1                               *Line up digits according to

3 1 6                                their value. (Hundreds, Tens,

Units)

* Start by subtracting the units.

Have a go with these Spicy

H T U       H T U       H T U       H T U       H T U       H T U

8 9 4       7 6 3       4 9 5       8 2 6        6 4 8       4 7 5

- 3 2 1     - 5 3 2     - 2 7 4     - 1 2 5      - 3 0 6     - 3 5 5

Medium

T U        T U        T U       T U       T U       T U

9 4        6 3        9 5       2 6       4 8        7 5

- 2 1      - 3 2      - 7 4     - 1 5     - 1 6      - 5 5

Subtraction - Mental Maths Strategy

When we are subtracting, we can use different strategies to help our speed  and our accuracy.

One strategy with subtraction is to count from the smallest number to the largest.

For instance, if we think about 100 - 98 =

We could use partitioning      100 - 90 - 8 =

It would be much quicker to start at 98 and count on to 100.

98       99      100

98 is 2 away from 100,      so 100 - 98 = 2

Try using this strategy using the Numeracy Ninja page.

Emoji Maths

Put your Maths skills to the test with these challenge pages.

Top