Subtract 9/42 from 9/30
9/30 - 9/42 is 3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
9/30 = 9 × 7/30 × 7 = 63/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
9/42 = 9 × 5/42 × 5 = 45/210 - Subtract the two like fractions:
63/210 - 45/210 = 63 - 45/210 = 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: 18/30-9/42 9/30-18/42 9/60-9/42 9/30-9/84 27/30-9/42 9/30-27/42 9/90-9/42 45/30-9/42 9/30-45/42 63/30-9/42 9/30-63/42