roxy spends 1/5 hour cleaning the table 3/10 hours washing dishes, and 4/5 hour reading a book. How many hours does she spend doing all these activities?

We're going to add all the time she spent doing all these activities.

When adding fractions remember to first find their least common denominator. 10 is the LCD.

Therefore,

1/5 becomes 2/10

3/10 remains the same because it already has a 10 in the denominator

4/5 becomes 8/10

Because they all have the same denominator you can now add the fractions by simply adding up the numerators and placing it over the common denominator.

2+3+8
_____ = 13/10
10

you may leave your answer likes this or make it into a mixed number by dividing 13 by 10 and putting the remainder over 10.

This will then look like this 1 3/10

1 _3_
10