Subtract 48/70 from 30/40
30/40 - 48/70 is 9/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
30/40 = 30 × 7/40 × 7 = 210/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
48/70 = 48 × 4/70 × 4 = 192/280 - Subtract the two like fractions:
210/280 - 192/280 = 210 - 192/280 = 18/280 - After reducing the fraction, the answer is 9/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40-48/70 30/40-96/70 30/80-48/70 90/40-48/70