2. Write the pure repeating (recurring) decimal number as an improper fraction.
1.16 can be written as an improper fraction.
- The numerator is larger than or equal to the denominator.
Set up the first equation.
- Let y equal the decimal number:
y = 1.16
Set up the second equation.
- Number of decimal places repeating: 2
Multiply both sides of the first equation by 102 = 100
y = 1.16
100 × y = 100 × 1.16
100 × y = 116.16
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.
100 × y - y = 116.16 - 1.16 ⇒
(100 - 1) × y = 116.16 - 1.16 ⇒
We now have a new equation:
99 × y = 115
Solve for y in the new equation.
99 × y = 115 ⇒
y = 115/99
Let the result written as a fraction.
Now we can write the number as a fraction.
According to our first equation:
y = 1.16
According to our calculations:
y = 115/99
⇒ 1.16 = 115/99
3. Reduce (simplify) the fraction above:
115/99
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).
115 = 5 × 23
99 = 32 × 11
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
But, the numerator and the denominator have no common factors.
GCF (5 × 23; 32 × 11) = 1
The numerator and the denominator are coprime numbers (no common prime factors, GCF = 1). So, the fraction cannot be reduced (simplified): irreducible fraction.