Question

Boris finished his chemistry assignment in 7/8 hours. Then he completed his math assignment in 1/2
hours. How much more time did Boris spend on his chemistry
answer as a fraction in simplest form

Answer 1

Writing fractions with the common denominator 8:

Time for Chemistry assignment: $7/8$

Time for Math assignment: $(1/2)(4/4)=4/8$

The difference is: $7/8-4/8=3/8$

Answer: $3/8$  hours