Subtract 70/20 from 12/18
1st number: 12/18, 2nd number: 3 10/20
12/18 - 70/20 is -17/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
12/18 = 12 × 10/18 × 10 = 120/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
70/20 = 70 × 9/20 × 9 = 630/180 - Subtract the two like fractions:
120/180 - 630/180 = 120 - 630/180 = -510/180 - After reducing the fraction, the answer is -17/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-70/20 12/36-70/20 12/18-70/40 36/18-70/20 12/54-70/20 12/18-70/60 60/18-70/20 12/90-70/20 84/18-70/20