Subtract 9/15 from 30/42
30/42 - 9/15 is 4/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
9/15 = 9 × 14/15 × 14 = 126/210 - Subtract the two like fractions:
150/210 - 126/210 = 150 - 126/210 = 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: 60/42-9/15 30/42-18/15 30/84-9/15 30/42-9/30 90/42-9/15 30/42-27/15 30/42-9/45 30/42-45/15 30/42-9/75 30/42-63/15