Subtraction tip!

Hi Year 5,

I know we are just finishing our adding and subtracting topic and most of us understand exchanging! However, a few of us are still doing amazingly well but are making silly mistakes when answering questions like 4000-1837 because it is hard to exchange the 4000.

So I thought I would teach you a new tip!

Rather than trying to work the question out, if you subtract 1 from both your biggest number, and the number you are taking away, you get the same answer! 

So, 4000- 1837 is the same as doing 3999- 1836. How amazing is that?! 

Any questions- let me know :)

Miss Starkey 

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