Subtract 3/20 from 7/84
7/84 - 3/20 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
7/84 = 7 × 5/84 × 5 = 35/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
3/20 = 3 × 21/20 × 21 = 63/420 - Subtract the two like fractions:
35/420 - 63/420 = 35 - 63/420 = -28/420 - After reducing the fraction, the answer is -1/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/84-3/20 7/84-6/20 7/84-3/40 21/84-3/20 7/84-9/20 7/84-3/60 35/84-3/20 7/84-15/20 49/84-3/20 7/84-21/20