When rounding doo you round up or down on 4.5?

You round up.

My teachers always said if it’s. 5 or above you round up and if it’s. 4 or below you round down

How to Round Numbers?

Decide which is the last digit to keep.

Leave it the same if the next digit is less than 5 (rounding down)

But increase it by 1 if the next digit is 5 or more (rounding up)

We have 4.5

If we want rounding to the whole, then we look at tenth. We have 5, therefore rounding up

4.5 ≈ 5