2. Write the number as an improper fraction.
- 9.89287 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:
9.89287 = 9.89287/1
Turn the top number into a whole number.
- Multiply both the top and the bottom by the same number.
- This number is: 100,000.
- 1 followed by as many 0-s as the number of digits after the decimal point.
9.89287/1 =
(9.89287 × 100,000)/(1 × 100,000) =
989,287/100,000
3. Reduce (simplify) the fraction above:
989,287/100,000
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).
989,287 = 13 × 76,099
100,000 = 25 × 55
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 (13 × 76,099; 25 × 55) = 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.
989,287 ÷ 100,000 = 9, remainder = 89,287 ⇒
989,287 = 9 × 100,000 + 89,287 ⇒
989,287/100,000 =
(9 × 100,000 + 89,287) / 100,000 =
(9 × 100,000) / 100,000 + 89,287/100,000 =
9 + 89,287/100,000 =
9 89,287/100,000