Jerome has 1/2 of the group's video games at his house. Mario has 2/5 of the group's video games at his

house. What fraction of the group's video games is either at Jerome's house or Mario's house?

9/10

Step-by-step explanation:

you find the lowest common denominator in this case is 10

then you take 1/2 and multiply it by 5 both the bottom and top and then you should get 5/10

next you do the same with 2/5 but this time to the get the denominator to 10 you multiply by 2 again multiply both bottom and top and you should get 4/10

now you just add 4/10 and 5/10 together and you get 9/10 or 0.9 as a decimal