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It is: 1.8/300 times 100 = 0.6% or 3/5 percent
The three numbers that multiply together to equal 18 are 1, 2, and 9. This is because 1 x 2 x 9 = 18. These numbers are the factors of 18, which are integers that can be multiplied together to give the original number.
Presumably, the theory is that it's easier to multiply by small numbers than larger ones. If there's a number that you need multiplied by 18, multiply it by 3, then multiply that total by 3, then multiply that total by 2.
If you multiply 2*9, you get 18. Multiply that by 10 to get a three digit number, and you get 180.