Subtract 12/30 from 20/84
20/84 - 12/30 is -17/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
20/84 = 20 × 5/84 × 5 = 100/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
12/30 = 12 × 14/30 × 14 = 168/420 - Subtract the two like fractions:
100/420 - 168/420 = 100 - 168/420 = -68/420 - After reducing the fraction, the answer is -17/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84-12/30 20/84-24/30 20/84-12/60 60/84-12/30 20/84-36/30 20/84-12/90 20/84-60/30 20/84-84/30