Subtract 70/7 from 15/30
1st number: 15/30, 2nd number: 10 0/7
15/30 - 70/7 is -19/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
70/7 = 70 × 30/7 × 30 = 2100/210 - Subtract the two like fractions:
105/210 - 2100/210 = 105 - 2100/210 = -1995/210 - After reducing the fraction, the answer is -19/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/60-70/7 15/30-70/14 45/30-70/7 15/90-70/7 15/30-70/21 75/30-70/7 15/30-70/35 15/30-70/49