For starters, just get that 4 out of the way. It's already part of the mixed number. Next step is to make the .625 a fraction. It has three places after the decimal so put it over 1000. (If it had been 2 places after the decimal, you'd put it over 100). you could leave it at 4 625/1000 but we should probably reduce it. Both numerator and denomiator are divisible by 25 for sure, so now we have 4 25/40. Looks like both of those are still divisible by 5 so now we get, 4 5/8 and there's your answer.