What is four fifths plus seven tenths?

four fifths plus seven tenths is a very easy "equation" to solve. First you convert 4/5 into 8/10. Second you add 8+7 since you are adding. Lastly, since 8+7=15 the answer is 15/10.

15/10 is equal to 1 and 5/10 or 1 and 1/2

the answer is 1 & 1/2