54
15
Prime factorization of 99 = 3 * 3 * 11
3 x 3 x 3 x 5 = 135
3 x 5 x 5 = 75
15 since you multiply by 3 then subtract 3 in sequence
How about: 3 times -6 = -18 as one example
15
They are: 1*18 = 18, 2*9 = 18 and 3*6 = 18
3 x6 =18 2 x9 =18 1 x 18 =18
You can multiply the number 18 by different numbers that are relatively prime, for example by different prime numbers.
The two numbers that multiply to 162 are 9 and 18. To find these numbers, you need to factorize 162 into its prime factors, which are 2, 3, and 3. By grouping these factors, you can see that 9 (3 x 3) and 18 (2 x 3 x 3) are the two numbers that multiply to 162.
-15
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.
The prime factors of 18 are 2, 3, and 3. When multiplied together, 2 x 3 x 3 equals 18. These are the three prime numbers that multiply to give 18.
135
21
1 x 18, 2 x 9, 3 x 6