Question

If 15 is rounded off to the nearest tens, we will round the number ___ to the nearest tens to get ____.

• A. down, 10
• B. up, 20

Answer 1

The correct option is B up, 20

Since the digit at the ones place of 15 is equal to 5, we round up the number, i.e. we round it off to the nearest 10 that comes after the number.

If the ones digit of a number is greater than or equal to 5, we round the number up to the nearest ten.

Let’s look at an example.
15 lies between 10 and 20. Since, the ones digit of 15 is 5, it will be rounded up to 20.