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。
2.
The multiply key 乘号键。
3.
Although the two numbers multiplied together are often called factors , they are also known as the multiplicand and multiplier , with the multiplicand being the number to the left of the multiplication sign 虽然相乘的两个数都叫做因子，他们也可以叫做被乘数和乘数，被乘数是乘号左边的数。
