Subtract 24/30 from 3/42
3/42 - 24/30 is -51/70.
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,
3/42 = 3 × 5/42 × 5 = 15/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
24/30 = 24 × 7/30 × 7 = 168/210 - Subtract the two like fractions:
15/210 - 168/210 = 15 - 168/210 = -153/210 - After reducing the fraction, the answer is -51/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-24/30 3/42-48/30 3/84-24/30 3/42-24/60 9/42-24/30 3/42-72/30 3/42-24/90 15/42-24/30 21/42-24/30