Subtract 3/10 from 9/42
9/42 - 3/10 is -3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 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 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Subtract the two like fractions:
45/210 - 63/210 = 45 - 63/210 = -18/210 - After reducing the fraction, the answer is -3/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42-3/10 9/42-6/10 9/84-3/10 9/42-3/20 27/42-3/10 9/42-9/10 9/42-3/30 45/42-3/10 9/42-15/10 9/42-3/50 63/42-3/10 9/42-21/10 9/42-3/70