Subtract 54/15 from 30/70
1st number: 30/70, 2nd number: 3 9/15
30/70 - 54/15 is -111/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
30/70 = 30 × 3/70 × 3 = 90/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
54/15 = 54 × 14/15 × 14 = 756/210 - Subtract the two like fractions:
90/210 - 756/210 = 90 - 756/210 = -666/210 - After reducing the fraction, the answer is -111/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70-54/15 30/70-54/30 90/70-54/15 30/70-54/45 30/70-54/75