This week in my maths class Room 12 WALT: solve addition problems by first adding a tidy number and then subtracting a small number to compensate.
If you look at the paper you cans see that we have to use number lines to help us but if we know it by place value then we can do it like that but we have to round the numbers up to tidy numbers.If you want a e.g then ...
35+27=
30+30=60-2=58+5=63
We learn this because it can help us do maths in our head like when we go shopping we have to know how much to give to the counter and if we have to pay gas then we have to know how much you have to pay and how much you can keep.
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