Subtract 70/20 from 15/30
1st number: 15/30, 2nd number: 3 10/20
15/30 - 70/20 is -3/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
15/30 = 15 × 2/30 × 2 = 30/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
70/20 = 70 × 3/20 × 3 = 210/60 - Subtract the two like fractions:
30/60 - 210/60 = 30 - 210/60 = -180/60 - After reducing the fraction, the answer is -3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/60-70/20 15/30-70/40 45/30-70/20 15/90-70/20 15/30-70/60 75/30-70/20