小明用算盘来做数学题。

Xiaoming uses an abacus to do math problems.

小明在做数学题时忘记了进位，所以答案错了。

Xiaoming forgot to carry when doing the math problem, so the answer was wrong.

他就会做数学题来使自己睡着。

He would do math to put himself to sleep.

你可以做数学题。

And you can do the math.

也许你会想,我们应让这些机器为我们做数学题.

Maybe you think we should let those machines do our math problem.

这些仪器扫描显示阅读、做数学题等行为引起脑内相应的活动区域。

When people are hooked up to these machines, tasks, such as reading or doing math problems, each have corresponding areas of the brain where activity can be observed.

尤其通过中间和侧面前额皮质大脑活动，研究者能判断志愿者做数学题时是决定将两个数字相加还是相减。

Specifically, the researchers determined whether a volunteer decided to add or subtract two numbers in a math exercise from patterns of brain activity in the medial and lateral prefrontal cortex.