What is .8 as a fraction and decimal?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Write the fraction or mixed number and the decimal shown by the model

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?