It took Tristan 2 1/4 hours to do a biome report. It took Yajaira 1 2/3 hours to do her biome report. a. How much longer did it take Tristan to do his report?
Find the difference
so
2 1/4-1 2/3
Convert mixed numbers to an improper fractions
2 1/4=2+1/4=9/4
1 2/3=1+2/3=5/3
substitute
9/4-5/3=(3*9-4*5)/12=7/12
answer is 7/12 hours