在数学中，我们用乘号表示乘法。

In mathematics, we use the multiplication sign to indicate multiplication.

我们在计算时需要用到乘号。

We need to use the multiplication sign when we do calculations.

你知道如何在键盘上输入乘号吗？

Do you know how to type the multiplication sign on the keyboard?

老师在黑板上写下了一个大大的乘号。

The teacher wrote a big multiplication sign on the blackboard.

这个等式中的乘号看起来像一个小叉号。

The multiplication sign in this equation looks like a small cross.

乘号表示两个数字相乘的关系.

A multiplication sign indicates the multiplicative relationship between two numbers.

这个表达式中，我们不需要乘号或括号。

In this expression, we don't need a multiplication sign.

这个表达式中，我们不需要乘号或括号。

In this expression, we don't need a multiplication sign or parenthesis.

这个表达式中, 我们不需要乘号或括号.

In this expression, we do not need a multiplication sign or parenthesis.

他们也会有自己的乘号，代表圆周率的π，当然还有等于号。

They'd have their own multiplication sign, symbol for pi, and, of course, equals.