例句
在办公室里有能做乘法除法的计算尺，以及能加减乘除的台式计算机。
In offices there are slide rules for multiplication and division, and desk machines which can add, subtract, multiply and divide.
例句
年长者表现不太好的方面则是：(数字能力加减乘除运算的速度)以及感知速度听到指令按下按钮的速度。
Where they fared less well was number ability ( how quickly you can multiply, add, subtract and divide) and perceptual speed-how fast you can push a button when prompted.
