Round 3.14159 to 18 Decimal Places

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 18 decimal places.

The deciding digit (the one to the right of our rounding position) is: 0

The deciding digit is 0.

Since 0 is less than 5, we round DOWN.

3.14159 rounded to 18 decimal places = 3.14159

Original number: 3.14159

Rounded result: 3.14159

The difference is 0.0000000000, which confirms our rounding is correct.

The rounded value is as close as possible to the original while having only 18 decimal places.