
To subtract unlike fractions, we convert them into equivalent like fractions and then subtract the numerator without disturbing the denominator. After the subtraction, the fractions can be simplified. Subtracting Fractions Calculator (or Fraction Subtraction Calculator) takes two fractions and subtracts the second one from the first one and then simplifies the resulting fraction. It works for fractions with same denominators (like fractions) as well as fractions with different denominators (unlike fractions). 
Calculate the Least Common Denominator (LCD) of the fractions
Rename the fractions to have the LCD
Subtract the numerators of the fractions and write in fraction, simplify the fraction if needed.
Subtract the fractions 6/7 and 3/14.
Given : (6 / 7)  (3 / 14).
Calculating the LCD 7 and 14
7 * 2 = 14 .
14 * 1 = 14 .
So 14 is the least common number which is divisible by both 7 and 14
Multiply numerator and denominator with 2 for (fraction 1).
(6/7) * (2/2) = 12/14 => (fraction 1)
Multiply numerator and denominator with 1 for (fraction 2).
(3/14) * (1/1) = 3/14 => (fraction 2)
From (fraction 1) and (fraction 2) we got = (12 / 14)  (3 / 14) {Note here the denominators are same}
So,we keep the denominators part same and subtract numerators part.
Numerator of (fraction 1) = 12
Numerator of (fraction 2) = 3
Subtract = 12  3 = 9
Fraction = 9/14.
9 / 14.
Subtract the fractions 5/9 and 5/6.
Given: (5 / 9)  (5 / 6).
Calculating the LCD 9 and 6
9 * 2 = 18.
6 * 3 = 18.
So 18 is the least common number which is divisible by both 9 and 6 .
Multiply numerator and denominator with 2 for (fraction 1).
(5/9) * (2/2) = 10/18 (fraction 1).
Multiply numerator and denominator with 3 for (fraction 2).
(5/6) * (3/3) = 15/18 (fraction 2).
From (fraction 1) and (fraction 2) we got = (10 / 18)  (15 / 18) {Note here the denominators are same}
So,we keep the denominators part same and subtract numerators part.
Numerator of (fraction 1) = 10
Numerator of (fraction 2) = 15
Subtract = 10  15 = 5 .
Fraction = 5 /18.
5/18.