Chloe has enough sand to fill a sandbox with an area of 36 square units. She wants the outer edges of the sandbox to use as little material as possible.

Rounding  means we are finding the closest  benchmark number. abenchmark number  is one that is easy to  use  in operations and/or quicker to say and write. a  number  line can us  round  by showing the closestbenchmark number. five is the midpoint  between  0 and 10.