2. Write the pure repeating (recurring) decimal number as a proper fraction.
0.327 can be written as a proper fraction.
- The numerator is smaller than the denominator.
Set up the first equation.
- Let y equal the decimal number:
y = 0.327
Set up the second equation.
- Number of decimal places repeating: 3
Multiply both sides of the first equation by 103 = 1,000
y = 0.327
1,000 × y = 1,000 × 0.327
1,000 × y = 327.327
Subtract the first equation from the second one.
- Having the same number of decimal places ...
- The repeating pattern drops off by subtracting the two equations.
1,000 × y - y = 327.327 - 0.327 ⇒
(1,000 - 1) × y = 327.327 - 0.327 ⇒
We now have a new equation:
999 × y = 327
Solve for y in the new equation.
999 × y = 327 ⇒
y = 327/999
Let the result written as a fraction.
Now we can write the number as a fraction.
According to our first equation:
y = 0.327
According to our calculations:
y = 327/999
⇒ 0.327 = 327/999
3. Reduce (simplify) the fraction above:
327/999
to the lowest terms, to its simplest equivalent form, irreducible.
To reduce a fraction to the lowest terms divide the numerator and denominator by their greatest (highest) common factor (divisor), GCF.
Factor the numerator and denominator (prime factorization).
327 = 3 × 109
999 = 33 × 37
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
GCF (3 × 109; 33 × 37) = 3
Divide both the numerator and the denominator by their GCF.
327/999 =
(3 × 109)/(33 × 37) =
((3 × 109) ÷ 3) / ((33 × 37) ÷ 3) =
109/(32 × 37) =
109/333