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 :)