Subtract 15/10 from 30/42
1st number: 30/42, 2nd number: 1 5/10
30/42 - 15/10 is -11/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
15/10 = 15 × 21/10 × 21 = 315/210 - Subtract the two like fractions:
150/210 - 315/210 = 150 - 315/210 = -165/210 - After reducing the fraction, the answer is -11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-15/10 30/42-30/10 30/84-15/10 30/42-15/20 90/42-15/10 30/42-45/10 30/42-15/30 30/42-75/10 30/42-15/50 30/42-15/70