Question

Jerome's rain gauge show 13 9/10 CM at the end of last month at the end of this month the rain gauge showed 15 3/10 centimeter how many more centimeters of rain fell this month

Answer 1

What you must do for this case is subtract both quantities and verify the final result.
 We have then:
 15 3 / 10-13 9/10 =
 Rewriting
 15.3 - 13.9 =
 1.4 =
 1 4/10
 answer:
 this month fell 1 4/10 more centimeters of rain