Subtract 90/48 from 30/70
1st number: 30/70, 2nd number: 1 42/48
30/70 - 90/48 is -81/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 48 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 70 × 24 = 1680,
30/70 = 30 × 24/70 × 24 = 720/1680 - Likewise, for the 2nd fraction, since 48 × 35 = 1680,
90/48 = 90 × 35/48 × 35 = 3150/1680 - Subtract the two like fractions:
720/1680 - 3150/1680 = 720 - 3150/1680 = -2430/1680 - After reducing the fraction, the answer is -81/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70-90/48 30/70-90/96 90/70-90/48