Step 1: Identify the number of decimal places

The decimal 18.211 has 3 decimal places.

Step 2: Multiply by the appropriate power of 10

Multiply by 10³ = 1000 to eliminate the decimal point.

18.211 × 1000 = 18211

Step 3: Write as a fraction

Step 4: Simplify the fraction

Find the greatest common divisor (GCD) of 18211 and 1000.

GCD(18211, 1000) = 1

Divide both the numerator and denominator by the GCD: