Subtract 18/8 from 7/84
1st number: 7/84, 2nd number: 2 2/8
7/84 - 18/8 is -13/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
7/84 = 7 × 2/84 × 2 = 14/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Subtract the two like fractions:
14/168 - 378/168 = 14 - 378/168 = -364/168 - After reducing the fraction, the answer is -13/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/84-18/8 7/84-36/8 7/84-18/16 21/84-18/8 7/84-54/8 7/84-18/24 35/84-18/8 7/84-90/8 7/84-18/40 49/84-18/8 7/84-18/56