Question

Tina practice piano for 15 hours last month and 45 hours this month. Use addition to write a statement comparing the hours Tina practice during the two months

Answer 1

The total number of hours practicing is 60 hours for those two months.

Answer 2

A regular month has more or less 30 days in it. So 1 month is equal to 30 days. There are 24 hours in a day, hence 30*24 = 720. There are 720 hours in a month. 

15/720 * 100 = 2.1%
45/720 * 100 = 6.25%

Hence, Tina had more hours of practice this month just with a difference of 4.15%.