Subtract 10/30 from 9/42
9/42 - 10/30 is -5/42.
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,
9/42 = 9 × 5/42 × 5 = 45/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Subtract the two like fractions:
45/210 - 70/210 = 45 - 70/210 = -25/210 - After reducing the fraction, the answer is -5/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-10/30 9/42-20/30 9/84-10/30 9/42-10/60 27/42-10/30 9/42-10/90 45/42-10/30 9/42-50/30 63/42-10/30 9/42-70/30