Changing a fraction to a percent

By dinnertime sean completed 4/5 of his homework. 
What percent of his homework did sean do by dinnertime?
What percent of his homework did sean have remaining?

4
---
5

= .2 {divided 4 by 5}
= 80% {moved decimal point right two places to change decimal to percent}
Sean did 80% by dinnertime

100% - 80%
= 20% {the percent he had left}
Sean had 20% left

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