2. Write the mixed repeating (recurring) decimal number as a proper fraction.
0.57148 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 = 0.57148
Set up the second equation.
- Number of decimal places repeating: 3
Multiply both sides of the first equation by 103 = 1,000
y = 0.57148
1,000 × y = 1,000 × 0.57148
1,000 × y = 571.48148
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 = 571.48148 - 0.57148 ⇒
(1,000 - 1) × y = 571.48148 - 0.57148 ⇒
We now have a new equation:
999 × y = 570.91
Solve for y in the new equation.
999 × y = 570.91 ⇒
y = 570.91/999
Let the result written as a fraction.
Now we can write the number as a fraction.
According to our first equation:
y = 0.57148
According to our calculations:
y = 570.91/999
⇒ 0.57148 = 570.91/999
Get rid of the decimal places in the fraction above.
- Multiply the top and the bottom number by 100.
- 1 followed by as many 0-s as the number of digits after the decimal point.
0.57148 = (570.91 × 100)/(999 × 100)
0.57148 = 57,091/99,900
3. Reduce (simplify) the fraction above:
57,091/99,900
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).
57,091 = 37 × 1,543
99,900 = 22 × 33 × 52 × 37
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
GCF (37 × 1,543; 22 × 33 × 52 × 37) = 37
Divide both the numerator and the denominator by their GCF.
57,091/99,900 =
(37 × 1,543)/(22 × 33 × 52 × 37) =
((37 × 1,543) ÷ 37) / ((22 × 33 × 52 × 37) ÷ 37) =
1,543/(22 × 33 × 52) =
1,543/2,700