Do math problems in your head instead of on a calculator.
心算而不是用计算器计算。
Why do you think that math books have so math problems?
你为什么认为数学书有那样的数学题呢？
Lisa: No, he just gave me a sheet of math problems to do.
莉萨：没有，他只是给我一张数学卷子做。
Lisa: No, he just gave me a sheet of math problems to do.
莉萨：没有，他只是给我一张数学卷子做。
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