So, we need to make the denominator equal 100 so lets divide 100 by 8 to figure out what number we need to multiply the denominator by. 100/8=12.5
Now we know that to make 8 equal 100 we need to multiply the fraction by 12.5. Since we are multiply the denominator by 12.5 we also need to multiply the numerator by 8. (5*12.5)/(8*12.5)=62.5/100
Now we need to get rid of the decimal in our fraction so we can multiply both sides by 10 to move the decimal over (62.5*10)/(100*10)=625/1000
Any number over a multiply of ten can be written in decimal form so 625/1000=.625
