Subtract 21/30 from 12/8
1st number: 1 4/8, 2nd number: 21/30
12/8 - 21/30 is 4/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
12/8 = 12 × 15/8 × 15 = 180/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
21/30 = 21 × 4/30 × 4 = 84/120 - Subtract the two like fractions:
180/120 - 84/120 = 180 - 84/120 = 96/120 - After reducing the fraction, the answer is 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8-21/30 12/8-42/30 12/16-21/30 12/8-21/60 36/8-21/30 12/8-63/30 12/24-21/30 12/8-21/90 60/8-21/30 12/40-21/30 84/8-21/30 12/56-21/30