2. Write the number as an improper fraction.
- 511.1 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:
511.1 = 511.1/1
Turn the top number into a whole number.
- Multiply both the top and the bottom by the same number.
- This number is: 10.
- 1 followed by as many 0-s as the number of digits after the decimal point.
511.1/1 =
(511.1 × 10)/(1 × 10) =
5,111/10
3. Reduce (simplify) the fraction above:
5,111/10
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).
5,111 = 19 × 269
10 = 2 × 5
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 (19 × 269; 2 × 5) = 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.
5,111 ÷ 10 = 511, remainder = 1 ⇒
5,111 = 511 × 10 + 1 ⇒
5,111/10 =
(511 × 10 + 1) / 10 =
(511 × 10) / 10 + 1/10 =
511 + 1/10 =
511 1/10