Subtract 42/10 from 28/30
1st number: 28/30, 2nd number: 4 2/10
28/30 - 42/10 is -49/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 10 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
28/30 = 28 × 1/30 × 1 = 28/30 - Likewise, for the 2nd fraction, since 10 × 3 = 30,
42/10 = 42 × 3/10 × 3 = 126/30 - Subtract the two like fractions:
28/30 - 126/30 = 28 - 126/30 = -98/30 - After reducing the fraction, the answer is -49/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/30-42/10 28/30-84/10 28/60-42/10 28/30-42/20 84/30-42/10 28/90-42/10 28/30-42/30 28/30-42/50 28/30-42/70