How do you round deicimals?

Answer 1

The basic rule to remember is that 1-4 rounds down, 5-9 rounds up. See which category the last number falls into. If it rounds down, keep the number in front of it the same; if it rounds up, move the previous number up one digit. After this, drop the number you used to round.

As an example, the number 1.4

The last number, 4, falls in the first range. Because it rounds down 1 stays the same and we drop the four. This number rounds down to 1.

1.5, on the other hand, would round up to 2 because 5 falls in the second range of numbers. The one bumps up to a 2 and the 5 is dropped.

Some questions may specify which decimal place they want you to round to, in which case you look at the number AFTER the place they specify. For example, if you were asked to round 1.23 to the tens place:

2 is in the tenths place, so look at the next number, 3.

3 falls in the first range, so this number will round down to 1.2