Question

Mercury orbits the Sun in 87 24/25 Earth days. Venus orbits the Sun in 224 7/10Earth days, and Mars

Answer 1

The easiest and the best way to get to the answer would be to convert the denominators into either 100 or 10. This way the answers can be easily arrived at.

Mercury =87 24/25
         = 87 96/100
         = 87.96

Venus = 224 7/10
           = 224.7

Mars = 686 49/50
         = 686 98/100
         = 686.98

I hope that the answers have come to your great help and the procedure is also clear enough for you to understand.