6 7/7 – 2 21/5
multiply the whole number by the denominator

49/7 – 31/5 Find a
common denominator (35) and cross multiply to make each have the same denominator

245/35 – 217/35 This
was accomplished by multiplying 49 by 5 for the numerator in the first, and 31
by 7 for the numerator in the second.

245/35 – 217/35 = 28/35
subtract. The answer needs to be reduced. 7 will go into each, so divide
both the numerator and the denominator by 7 to simplify.