The multiplication sign is shown as X in maths
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easy ask your mom
lattice math is a silly way to do multiplication. I recommend you not to do it.
The answer to the problem 390 times 20 is 7800. The easiest way to work multiplication problems is to use a simple calculator. Another easy way is to know your mulitplication tables.
study your multiplication tables by making up a game or something that's fun so youll pay attention and learn.
mult.