I think Ben is taller because if you change both fractions to the common denominator of 8 Ben's height would be 5ft 2.5/8 and Marcus's height would be 5ft 2.3333/8. :)
As stated above Marcus is 5 7/24 feet tall and Ben is 5 5/16 feet tall. To see which of the two boys is taller we have to convert the mixed fraction into an Improper fraction. To convert the improper fraction multiply the denominator and whole number, then add the numerator.
5 7/24 : To convert the mixed fraction multiply the denominator and whole number, then add the numerator.
Therefore 24 * 7 + 5 = improper fraction
5 5/16 : To convert the mixed fraction multiply the denominator and whole number, then add the numerator.
