so if you read 450 out of 720 that could be represented as a fraction as 450/720 but normally you would simplify it by finding the greatest common factor or the GCF and for this problem the GCF would be 90 so we would divide both sides by 90, so 450/90 is 5 and 720/90 is 8 so that leaves us with 5 as our numerator and 8 as the denominator or 5/8 also shown as 0.625(decimal version). That is all. I hope that this wasn't too confusing and if there are any wrong parts please do correct me . Thank you