Subtract 12/20 from 3/70
3/70 - 12/20 is -39/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
3/70 = 3 × 2/70 × 2 = 6/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
12/20 = 12 × 7/20 × 7 = 84/140 - Subtract the two like fractions:
6/140 - 84/140 = 6 - 84/140 = -78/140 - After reducing the fraction, the answer is -39/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/70-12/20 3/70-24/20 3/70-12/40 9/70-12/20 3/70-36/20 3/70-12/60 15/70-12/20 3/70-60/20 21/70-12/20 3/70-84/20