In China, the operands and objects of the four operations are unified, so the multiplicand is put in front and the multiplier is put behind. Pronunciation is "a times n" or "n times a" But in other languages (such as English), it is possible to put the multiplier in front and write it as {n x a}, which is read as "n times a".
Law of product change:
1, if one factor remains the same, how many times does another factor expand (or contract), and the product will also expand (or contract) by the same multiple.
2. How many times one factor expands (or shrinks) and another factor shrinks (or expands) by the same multiple, and their product remains unchanged.
3. When one factor is multiplied by (or divided by) A and another factor is multiplied by (or divided by) B, the product is multiplied by (or divided by) the product of ab.