Subtract 2/8 from 42/15
1st number: 2 12/15, 2nd number: 2/8
42/15 - 2/8 is 51/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
42/15 = 42 × 8/15 × 8 = 336/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
2/8 = 2 × 15/8 × 15 = 30/120 - Subtract the two like fractions:
336/120 - 30/120 = 336 - 30/120 = 306/120 - After reducing the fraction, the answer is 51/20
- In mixed form: 211/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15-2/8 42/15-4/8 42/30-2/8 42/15-2/16 42/15-6/8 42/45-2/8 42/15-2/24 42/15-10/8 42/75-2/8 42/15-2/40 42/15-14/8 42/15-2/56