How do I round off to the nearest 10, 100, 1000 and nearest one hundredth and nearest whole number

Answer 1

http://www.helpingwithmath.com/by_subject/place_value/rounding.htm
Read carefully.

AND
http://www.ixl.com/math/grade-2/round-to-nearest-ten-hundred-or-thousand
A place to practice.