Subtract 21/60 from 8/30
8/30 - 21/60 is -1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 60 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
8/30 = 8 × 2/30 × 2 = 16/60 - Likewise, for the 2nd fraction, since 60 × 1 = 60,
21/60 = 21 × 1/60 × 1 = 21/60 - Subtract the two like fractions:
16/60 - 21/60 = 16 - 21/60 = -5/60 - After reducing the fraction, the answer is -1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/30-21/60 8/30-42/60 8/60-21/60 24/30-21/60 8/30-63/60 8/90-21/60 40/30-21/60 56/30-21/60