Subtract 8/21 from 3/60
3/60 - 8/21 is -139/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
3/60 = 3 × 7/60 × 7 = 21/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
8/21 = 8 × 20/21 × 20 = 160/420 - Subtract the two like fractions:
21/420 - 160/420 = 21 - 160/420 = -139/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/60-8/21 3/60-16/21 3/60-8/42 9/60-8/21 3/60-24/21 3/60-8/63 15/60-8/21 3/60-40/21 21/60-8/21 3/60-56/21