2.5 : 0.05 (we see that the 0.05 has two decimal places so to make it a whole number we need to move the point two places to the right hand side for it to become a 5, which is a whole number).
Now we must do the same to the other side of the equation- if we take the 2.5 and move the point two places to the right hand side we seem to have a space 25? , we now fill that space with a (zero) 0 . Now that new whole number will become 250 .
577 is a prime number, but it's possible to have ratios fully reduced where both sides are still non-prime. If the first part of the ratio wasn't divisible by 7 as well a prime number calculator wouldn't work.
Dividing both parts of the ratio by the greatest common divisor of 7000 and 4039 (calculator) is the way to go. The GCD in this case is 7.