At that age, I'd take any excuse to make estimates and do minor arithmetic.
在那样的年纪，我会找任何借口做些估测或者小算术。
Logic and arithmetic do not commute before breakfast.
早餐前，不用考虑逻辑和算术的问题。
But it can also improve the brain's ability to do mental arithmetic.
它还能改善大脑做心算的能力。
At that age, I'd take any excuse to make estimates and do minor arithmetic.
在那样的年纪，我会找任何理由作些估测或者小算术。
One afternoon, the teacher assigned a hard arithmetic to do for us.
一天下午，老师布置了一道很难的算术题给我们做。
He could read, write, and do a little arithmetic, but that was all.
他会读会写，还会一点算术，但是仅仅如此而已。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
The little boy can already do simple problems in arithmetic.
那个小男孩已经能做简单的算术题了。
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