Subtract 6/42 from 21/20
1st number: 1 1/20, 2nd number: 6/42
21/20 - 6/42 is 127/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
21/20 = 21 × 21/20 × 21 = 441/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
6/42 = 6 × 10/42 × 10 = 60/420 - Subtract the two like fractions:
441/420 - 60/420 = 441 - 60/420 = 381/420 - After reducing the fraction, the answer is 127/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-6/42 21/20-12/42 21/40-6/42 21/20-6/84 63/20-6/42 21/20-18/42 21/60-6/42 21/20-30/42