Robyn ran 5 3/4 mikes last week she ran 4 1/10 mikes this week. how many more miles did she run last week

This question is easily answered by subtracting two fractions. But it is easier if both fractions are in improper form.
5 3/4 is equal to 23/4
4 1/10 is equal to 41/10

difference = 41/10 - 24/4
difference = [ (2*41) - (5*24) ] / 20
difference = (82 - 120) / 20
difference = -38/20
difference = -19/10 or -1 9/10 less

If you would like to know how many more miles did Robyn run last week, you can calculate this using the following steps:

last week: 5 3/4 = 23/4 miles = 115/20 miles
this week: 4 1/10 = 41/10 miles = 82/20 miles

115/20 - 82/20 = (115 - 82) / 20 = 33/20 = 1 13/20 miles

The correct result would be 1 13/20 miles.

Ihave, but this question is gonna probably get deleted.