Subtract 40/49 from 30/70
30/70 - 40/49 is -19/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 49 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 70 × 7 = 490,
30/70 = 30 × 7/70 × 7 = 210/490 - Likewise, for the 2nd fraction, since 49 × 10 = 490,
40/49 = 40 × 10/49 × 10 = 400/490 - Subtract the two like fractions:
210/490 - 400/490 = 210 - 400/490 = -190/490 - After reducing the fraction, the answer is -19/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70-40/49 30/70-80/49 30/70-40/98 90/70-40/49