Subtract 15/10 from 20/84
1st number: 20/84, 2nd number: 1 5/10
20/84 - 15/10 is -53/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 10 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 10 × 42 = 420,
15/10 = 15 × 42/10 × 42 = 630/420 - Subtract the two like fractions:
100/420 - 630/420 = 100 - 630/420 = -530/420 - 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: 40/84-15/10 20/84-30/10 20/84-15/20 60/84-15/10 20/84-45/10 20/84-15/30 20/84-75/10 20/84-15/50 20/84-15/70