Do math problems in your head instead of on a calculator.

心算而不是用计算器计算。

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Middle school is an important age because students have enough math capability to solve advanced problems, but they haven't really decided what they want to do with their lives.

中学是一个重要的年龄段，因为学生有足够的数学能力来解决高级问题，但他们还没有真正决定他们在生活中想做些什么。

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To do that, investigators had volunteers lie in a brain scanner and solve math problems.

在研究中，志愿者按照研究者的要求躺在脑部扫描仪中解决数学问题。

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In the study, Pollak and his colleagues asked 61 girls, ages 7 to 12, to give a speech or do math problems in front of an audience, a surefire way to make a kid stressed.

CNN: Stressed? Calling Mom helps, study says

Psychology professor Seth Roberts eats a half stick of butter every day because, he says, it speeds up his ability to do simple math problems by 5%.

FORBES: Magazine Article

Likewise, if you strive to complete a number of math problems in a designated amount of time, you'll do a better job than if you try for a lower number or you just tell yourself to work hard.

FORBES: Magazine Article