What's the scale factor of 450

1. 450 doesn’t end in 00, so it’s not divisible by 100.

2. The last two digits, 50, are not divisible by 4, so 450 is not divisible by 4.

3. 4 + 5 + 0 = 9, so 450 is divisible by 9. Therefore, I do a simple division problem, 450 : 9 = 50, leaving room on the page to do any other needed division problems above it

4. The previous quotient, 50, is not divisible by 9, but any number ending in 25, 50, or 75 is divisible by 25, so I divide it by 25 and get 2. Now I am finished dividing.

The numbers on the outside of the cake are 9, 25, and 2. I take the square root of each of those numbers and get 3, 5, and √2. The product of those square roots is 15√2. Thus √450 = 15√2.