By Stephany Elsworth, Updated Aug 30, 2022

Rounding to the nearest ten is a foundational math skill that simplifies numbers, making them easier to estimate and work with. It’s especially handy when you need a quick sense of quantity or cost without the precision of every unit.

Basic Rounding Rules

When rounding to the nearest ten, look at the ones digit:

• If the ones digit is 0‑4, round down to the lower ten.
• If the ones digit is 5‑9, round up to the higher ten.

For example, 7 rounds up to 10, 2 rounds down to 0, and 5 always rounds up to 10.

Applying the Rules to Two‑Digit Numbers

To round a two‑digit number, focus on its units place:

• 23 falls between 20 and 25, so it rounds down to 20.
• 47 falls between 45 and 50, so it rounds up to 50.
• 55 sits at the midpoint; since the ones digit is 5, it rounds up to 60.

By consistently applying these guidelines, you’ll quickly master rounding to the nearest ten.