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.