Subtract 25/42 from 9/30
9/30 - 25/42 is -31/105.
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,
25/42 = 25 × 5/42 × 5 = 125/210 - Subtract the two like fractions:
63/210 - 125/210 = 63 - 125/210 = -62/210 - After reducing the fraction, the answer is -31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/30-25/42 9/30-50/42 9/60-25/42 9/30-25/84 27/30-25/42 9/30-75/42 9/90-25/42 45/30-25/42 63/30-25/42