X × y =? Omit multiplier sign

Why must the number be written before the letter when the multiplication sign is omitted

It doesn't have to be written in the front, but people are used to it. It's better to write in the front. But when you get to high school, if you write 2 * a as A2, it's very easy to cause misunderstanding. People will think it's an identifier (equivalent to a variable, such as x) instead of 2 * a, If you write 2a, most people won't get it wrong. So I suggest you write it in the front

Omit the multiplication sign and write the following expressions. What is a × B × 2 equal to

Thank you

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