Subtract 12/8 from 20/84
1st number: 20/84, 2nd number: 1 4/8
20/84 - 12/8 is -53/42.
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,
20/84 = 20 × 2/84 × 2 = 40/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Subtract the two like fractions:
40/168 - 252/168 = 40 - 252/168 = -212/168 - After reducing the fraction, the answer is -53/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84-12/8 20/84-24/8 20/84-12/16 60/84-12/8 20/84-36/8 20/84-12/24 20/84-60/8 20/84-12/40 20/84-84/8 20/84-12/56