Question

When you round a number, which digits in the number helps you decide to round up or round down?

Answer 1

Depends on how you want to round. If it's a decimal such as 1.98, and I wanted to round to the nearest whole number, if the number right behind the decimal is greater than 5, then that number is rounded up. If it is below 5, round it down.

Answer 2

When we are rounding a number, the main rule is that if the number is greater than equal to 5, we round that to +1 number.

Like say you have to round 56.32. It will not round as .3 and 2 both are less than 5.

If you have to round 63.98. It will round to 64. As the 8 will become 9 and 99 will become .00 with an addition of plus 1 in 63.

Now when you are rounding to places, it works differently.

Like 23120 to thousands place. It becomes 23000 as 3 is less than 5.

But if you round 28920 to thousand place, it will be 29000 as 8 is greater than 5.