Alicia measured 1/4 yard of the blue diamonds fabric and 5/6 yard of the yellow bonnets fabric to make a quilt. rename each length of fabric. Use the number of inches in a yard as a common denominator

There are 36 inches in a yard, so that is the denominator being asked for.

1/4 yard = 9/36 yards
5/6 yard = 30/36 yards