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How to avoid silly mistakes in maths?

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How to avoid silly mistakes in maths?
I always make silly mistakes in maths
for example I write 123 which should be 132,I move a point to a wrong place,I use + and - incorrectly
Help me.how to avoid this.
How to avoid silly mistakes in maths?
e careful and check in the every end of problems solving.(这是直接的回答)
下面是对你写的翻译
如何避免在数学题中犯错?
我老是在做数学的时候犯严重的错误.比如,我把123写成32,把小数点放错位置.把正负好写反.
帮帮我,如何避免他?