2. Write the number as an improper fraction.
- 25.628 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:
25.628 = 25.628/1
Turn the top number into a whole number.
- Multiply both the top and the bottom by the same number.
- This number is: 1,000.
- 1 followed by as many 0-s as the number of digits after the decimal point.
25.628/1 =
(25.628 × 1,000)/(1 × 1,000) =
25,628/1,000
3. Reduce (simplify) the fraction above:
25,628/1,000
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).
25,628 = 22 × 43 × 149
1,000 = 23 × 53
Calculate the greatest (highest) common factor (divisor), GCF.
Multiply all the common prime factors by the lowest exponents.
GCF (22 × 43 × 149; 23 × 53) = 22
Divide both the numerator and the denominator by their GCF.
25,628/1,000 =
(22 × 43 × 149)/(23 × 53) =
((22 × 43 × 149) ÷ 22) / ((23 × 53) ÷ 22) =
(43 × 149)/(2 × 53) =
6,407/250
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.
6,407 ÷ 250 = 25, remainder = 157 ⇒
6,407 = 25 × 250 + 157 ⇒
6,407/250 =
(25 × 250 + 157) / 250 =
(25 × 250) / 250 + 157/250 =
25 + 157/250 =
25 157/250