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Someone help please with simple subtraction!

(6 Posts)
Keepon123 Tue 22-Mar-16 19:05:44

Can't for the life of me figure out how you're meant to do it the correct way with carrying tens etc!!!
Feel so stupid!

blueemerald Tue 22-Mar-16 19:07:46

You can't take away two separate numbers at the same time if you see what I mean. Either take one away then the other or add the two numbers to be taken away together and take that away from the original.

winchester1 Tue 22-Mar-16 19:12:31

Id add the two lower figures first so

- 2.82

You cant minus 2,from zero so you cross the five out and make it a.four and carry the ten over, you then cross the ten put make it a nine and carry the ten over (always going right).

winchester1 Tue 22-Mar-16 19:14:46

Sorry posted to soon

You then have
- 2.82

So working right to left the columns are 10-2


Dies that make sense?

Keepon123 Tue 22-Mar-16 22:28:14

Doh! Perfect ladies
Had figured out how to do it by adding the 2 numbers to be subtracted together first then subtracting (as you have suggested) but didn't realise you couldn't take 2 separate numbers at the same time!never have guessed I got a* at GCSE level maths...blush

Keepon123 Tue 22-Mar-16 22:28:31

Thank you

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