Rounding OFF

1. http://www.factmonster.com/math/numbers/rounding.html
2. https://www.mathsisfun.com/rounding-numbers.html
3. Here's the general rule for rounding:
   1. If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40.
   2. If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.
   3. https://www.ixl.com/math/grade-5/round-decimals
   4. http://www.aaamath.com/est-dec-round.htm