Subtract 18/30 from 25/42
25/42 - 18/30 is -1/210.
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,
25/42 = 25 × 5/42 × 5 = 125/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Subtract the two like fractions:
125/210 - 126/210 = 125 - 126/210 = -1/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-18/30 25/42-36/30 25/84-18/30 25/42-18/60 75/42-18/30 25/42-54/30 25/42-18/90 25/42-90/30