Noelle has 5/6 of a yard of purple ribbon and 9/10 of a yard of pink ribbon how much ribbon does she have altogether

Add 5/6 and 9/10

first look for a common denominator ... that's ... 30

so now the fractions are 25/30 + 27/30

add the numerators keep the common denominator.

52/30 in mixed number is 1 22/30, now reduce the fraction, divide by 2, so

1 11/15, so Noelle has 1 11/15 ribbon altogether.