Subtract 30/70 from 12/36
12/36 - 30/70 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 70 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 36 × 35 = 1260,
12/36 = 12 × 35/36 × 35 = 420/1260 - Likewise, for the 2nd fraction, since 70 × 18 = 1260,
30/70 = 30 × 18/70 × 18 = 540/1260 - Subtract the two like fractions:
420/1260 - 540/1260 = 420 - 540/1260 = -120/1260 - After reducing the fraction, the answer is -2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/36-30/70 12/36-60/70 12/72-30/70 12/36-90/70 60/36-30/70 84/36-30/70