Subtract 30/42 from 9/15
9/15 - 30/42 is -4/35.
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,
9/15 = 9 × 14/15 × 14 = 126/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Subtract the two like fractions:
126/210 - 150/210 = 126 - 150/210 = -24/210 - After reducing the fraction, the answer is -4/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15-30/42 9/15-60/42 9/30-30/42 9/15-30/84 27/15-30/42 9/15-90/42 9/45-30/42 45/15-30/42 9/75-30/42 63/15-30/42