2. Write the number as an improper fraction.
- 456.39 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:
456.39 = 456.39/1
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.
456.39/1 =
(456.39 × 100)/(1 × 100) =
45,639/100
3. Reduce (simplify) the fraction above:
45,639/100
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).
45,639 = 32 × 11 × 461
100 = 22 × 52
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 (32 × 11 × 461; 22 × 52) = 1
The numerator and the denominator are coprime numbers (no common prime factors, GCF = 1). So, the fraction cannot be reduced (simplified): irreducible fraction.
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.
45,639 ÷ 100 = 456, remainder = 39 ⇒
45,639 = 456 × 100 + 39 ⇒
45,639/100 =
(456 × 100 + 39) / 100 =
(456 × 100) / 100 + 39/100 =
456 + 39/100 =
456 39/100