Subtract 7/42 from 30/27
1st number: 1 3/27, 2nd number: 7/42
30/27 - 7/42 is 17/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 27 × 14 = 378,
30/27 = 30 × 14/27 × 14 = 420/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
7/42 = 7 × 9/42 × 9 = 63/378 - Subtract the two like fractions:
420/378 - 63/378 = 420 - 63/378 = 357/378 - After reducing the fraction, the answer is 17/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/27-7/42 30/27-14/42 30/54-7/42 30/27-7/84 90/27-7/42 30/27-21/42 30/81-7/42 30/27-35/42 30/27-49/42