Question

5 m for $6.45 or 240 CM for $3.19. Which is cheaper per meter?

Answer 1

Find the 2 different unit rates and compare them.

$6.45 / 5 m = $1.29 per meter

1 meter
240 cm converts to 249 cm * --------------------- = 2.49 meter
100 cm

and so $3.19 divided by 2.49 meters comes out to $1.28 per meter.

Which is cheaper, $1.28 per meter or $1.29 per meter?

Answer 2

The prefix centi means 1/100. So 240cm = 2.4m.