2. Write the mixed repeating (recurring) decimal number as a proper fraction.
0.272727275 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 = 0.272727275
Set up the second equation.
- Number of decimal places repeating: 1
Multiply both sides of the first equation by 101 = 10
y = 0.272727275
10 × y = 10 × 0.272727275
10 × y = 2.72727275
Get the same number of decimal places as for y:
10 × y = 2.727272755
Note: 2.727272755 = 2.72727275
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.
10 × y - y = 2.727272755 - 0.272727275 ⇒
(10 - 1) × y = 2.727272755 - 0.272727275 ⇒
We now have a new equation:
9 × y = 2.45454548
Solve for y in the new equation.
9 × y = 2.45454548 ⇒
y = 2.45454548/9
Let the result written as a fraction.
Now we can write the number as a fraction.
According to our first equation:
y = 0.272727275
According to our calculations:
y = 2.45454548/9
⇒ 0.272727275 = 2.45454548/9
Get rid of the decimal places in the fraction above.
- Multiply the top and the bottom number by 100,000,000.
- 1 followed by as many 0-s as the number of digits after the decimal point.
0.272727275 = (2.45454548 × 100,000,000)/(9 × 100,000,000)
0.272727275 = 245,454,548/900,000,000
3. Reduce (simplify) the fraction above:
245,454,548/900,000,000
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).
245,454,548 = 22 × 61,363,637
900,000,000 = 28 × 32 × 58
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
GCF (22 × 61,363,637; 28 × 32 × 58) = 22
Divide both the numerator and the denominator by their GCF.
245,454,548/900,000,000 =
(22 × 61,363,637)/(28 × 32 × 58) =
((22 × 61,363,637) ÷ 22) / ((28 × 32 × 58) ÷ 22) =
61,363,637/(26 × 32 × 58) =
61,363,637/225,000,000