Marc has completed 60% of his science project. What fraction of his project has he NOT completed?

2 answers

60% = 60/100 = 6/10 completed

10/10 - 6/10 = NOT completed
60%=60/100=(2*3*10)(2*5*10)=3/5

1-(3/5)=(5/5)-(3/5)=2/5

40%= 2/5 NOT completed