Subtract 80/42 from 15/10
1st number: 1 5/10, 2nd number: 1 38/42
15/10 - 80/42 is -17/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
15/10 = 15 × 21/10 × 21 = 315/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
80/42 = 80 × 5/42 × 5 = 400/210 - Subtract the two like fractions:
315/210 - 400/210 = 315 - 400/210 = -85/210 - After reducing the fraction, the answer is -17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-80/42 15/20-80/42 15/10-80/84 45/10-80/42 15/30-80/42 75/10-80/42 15/50-80/42 15/70-80/42