Family Math Challenge (height)

1. The Year 4 class needed to line up in order of height (tallest to shortest) for their class photo. If the tallest student was 154cm and each person then on was 0.5cm shorter than the person in front, then how tall was the:

a) 2nd person in line? _____________153.5cm________________
b) 5th person in line? ____________152cm_________________
c) 10th person in line? ____________149.5cm_________________
(d) 17th person in line? ______________146cm_______________

I worked this out by drawing 17 faces and then writing the height down from the first person in line to the 17th person in line. I did this by taking away 5cm each time.