Subtract 7/20 from 15/84
15/84 - 7/20 is -6/35.
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,
15/84 = 15 × 5/84 × 5 = 75/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Subtract the two like fractions:
75/420 - 147/420 = 75 - 147/420 = -72/420 - After reducing the fraction, the answer is -6/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84-7/20 15/84-14/20 15/84-7/40 45/84-7/20 15/84-21/20 15/84-7/60 75/84-7/20 15/84-35/20 15/84-49/20