Subtract 7/42 from 12/15
12/15 - 7/42 is 19/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
12/15 = 12 × 14/15 × 14 = 168/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
7/42 = 7 × 5/42 × 5 = 35/210 - Subtract the two like fractions:
168/210 - 35/210 = 168 - 35/210 = 133/210 - After reducing the fraction, the answer is 19/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-7/42 12/15-14/42 12/30-7/42 12/15-7/84 36/15-7/42 12/15-21/42 12/45-7/42 60/15-7/42 12/15-35/42 12/75-7/42 84/15-7/42 12/15-49/42