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This is most often defined as the set of multiplication problems created by single-digit numbers. It includes problems from 1 x 1 to 9 x 9. Some people extend the definition to include multiplication problems up to 12 x 12.
9*6=54
there are multiplication, subtraction, addition, and division!
55
The inverse operation of multiplication is commonly known as division.Of course we must remember that we cannot divide by 0.Division.