Bounds of measurements homework?

The length of a roll of plastic sheeting is 500 cm, measured to the nearest 5 cm.

a) write down the least possible length and the greatest possible length of the roll of plastic sheeting.
least possible....... Greatest possible.........

b) a plastic sheet of length 100 cm, measured to the nearest 5 cm, is cut from the roll of plastic sheeting. find the least possible length of the sheeting left on the roll.

Thanks

?2013-09-15T09:55:24Z

Favorite Answer

Possible lengths are 500 ± 2.5

so, least possible is 497.5cm, greatest possible is 502.5cm

Cut sheet, least 97.5cm, greatest 102.5cm

Smallest roll - largest cut would give least remaining

=> 497.5 - 102.5 = 395cm

:)>