Solving problems in the fourth grade standard examination paper (mathematics)

180× 15=2700, which is the total output. 180+90=270. This is actually done every day. * * * There are 2700 parts, and 2700÷270= 10, which is the actual production days. Actual days-original days, 15- 10-5, you can finish the task five days ahead of schedule. Landlord, choose me, I am very careful when I speak.

I find that children are always sloppy when doing math. How to get rid of this bad habit?

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