Subtract 60/30 from 21/42
1st number: 21/42, 2nd number: 2 0/30
21/42 - 60/30 is -3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
60/30 = 60 × 7/30 × 7 = 420/210 - Subtract the two like fractions:
105/210 - 420/210 = 105 - 420/210 = -315/210 - After reducing the fraction, the answer is -3/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84-60/30 63/42-60/30 21/42-60/90