Question

Question #31cbf

Answer 1

When rounding, you only look at the decimal right behind the one you'll be rounding to.

If this is 5 or more, you round up , otherwise you just cut off (or round down, which is the same).

`(3pi)/4=2.35610...` 3d decimal is `6` so you round up : `2.36`

`(7pi)/4=5.4977...` 3d decimal is `7` so again up : `5.50`

Common mistake: Rounding in steps.
Task : Round `5.489` to a whole number
3rd decimal is 9 so the 8 before is is rounded up to 9
2th decimal is now 9, so 3th decimal is rounded up to 5
1st decimal is now 5, the answer is `6`
WRONG!
If you want a whole number, as in this case, you only look at the first decimal, which is 4, so the right answer is `5`
(Even 5.4999999 would be rounded to 5)