2. Write the number as an improper fraction.
- 127.55 can be written as an improper fraction.
- An improper fraction = the numerator is larger than or equal to the denominator..
Write down the number divided by 1, as a fraction:
127.55 = 127.55/1
Turn the top number into a whole number.
- Multiply both the top and the bottom by the same number.
- This number is: 100.
- 1 followed by as many 0-s as the number of digits after the decimal point.
127.55/1 =
(127.55 × 100)/(1 × 100) =
12,755/100
3. Reduce (simplify) the fraction above:
12,755/100
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).
12,755 = 5 × 2,551
100 = 22 × 52
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
GCF (5 × 2,551; 22 × 52) = 5
Divide both the numerator and the denominator by their GCF.
12,755/100 =
(5 × 2,551)/(22 × 52) =
((5 × 2,551) ÷ 5) / ((22 × 52) ÷ 5) =
2,551/(22 × 5) =
2,551/20
4. The fraction is an improper one, rewrite it as a mixed number (mixed fraction):
- A mixed number = an integer number and a proper fraction, of the same sign.
- Example 1: 2 1/5; Example 2: - 1 3/7.
- A proper fraction = the numerator is smaller than the denominator.
2,551 ÷ 20 = 127, remainder = 11 ⇒
2,551 = 127 × 20 + 11 ⇒
2,551/20 =
(127 × 20 + 11) / 20 =
(127 × 20) / 20 + 11/20 =
127 + 11/20 =
127 11/20