Multiplication and division are inverse of each other. In division, the answer you got in multiplication is the number divided. The two numbers you multiplied are the divisor and the answer.
You can make sure you division problem answer is correct by multiplying the answer and what you are dividing by. Same with multiplication, except the other way around.
Multiplication and division are related because multiplication is the inverse of division. Because if you do 3x4=12 that is multiplication, but then you can do 12/4 or 12/3.
Multiplication and division are the reverse of each other.
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