Subtract 30/70 from 12/49
12/49 - 30/70 is -9/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 70 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 49 × 10 = 490,
12/49 = 12 × 10/49 × 10 = 120/490 - Likewise, for the 2nd fraction, since 70 × 7 = 490,
30/70 = 30 × 7/70 × 7 = 210/490 - Subtract the two like fractions:
120/490 - 210/490 = 120 - 210/490 = -90/490 - After reducing the fraction, the answer is -9/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/49-30/70 12/49-60/70 12/98-30/70 36/49-30/70 12/49-90/70 60/49-30/70 84/49-30/70