Round 3.14159 to 1 Decimal Place

Rounding simplifies a number while keeping it close to the original value.

The rule: Look at the digit to the RIGHT of where you're rounding.

• If it's 5 or greater: round UP (increase the digit)

• If it's less than 5: round DOWN (keep the digit the same)

We want to round 3.14159 to the 1 decimal place.

The deciding digit (the one to the right of our rounding position) is: 4

The deciding digit is 4.

Since 4 is less than 5, we round DOWN.

3.14159 rounded to 1 decimal place = 3.1

Original number: 3.14159

Rounded result: 3.1

The difference is 0.0415900000, which confirms our rounding is correct.

The rounded value is as close as possible to the original while having only 1 decimal place.