Subtract 6/30 from 18/42
18/42 - 6/30 is 8/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
6/30 = 6 × 7/30 × 7 = 42/210 - Subtract the two like fractions:
90/210 - 42/210 = 90 - 42/210 = 48/210 - After reducing the fraction, the answer is 8/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-6/30 18/42-12/30 18/84-6/30 18/42-6/60 54/42-6/30 18/42-18/30 18/42-6/90 90/42-6/30 18/42-42/30