I learnt that you can use a number line or an place value house to figure out the answer to a maths question that you do not know. If you do not know how to use it then I’ll give you an example. If you have an answer like 393+424 you put the biggest number and put it at the start then break up the number 393 up to 300 90 3 then half all the numbers so then they're all like 300 half it to 100 200. So then it's like 100 +200 = 300. I learnt by using the number line and the place value house to answer my work and to finish my work.
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