1 x 21
3 x 7
7 x 3
21 x 1
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30x1 15x2 10x3
7 multiplied by 3 equals 21. Multiplication is a mathematical operation that combines groups of equal numbers to find a total quantity. In this case, you are taking 7 groups of 3 and finding the total quantity, which is 21. The multiplication symbol "x" is used to represent this operation.
If you are talking about factors, 1 and 61, because 61 is a prime number.
As a product of its prime factors: 2*3*3*5 = 90