Subtract 42/8 from 50/21
1st number: 2 8/21, 2nd number: 5 2/8
50/21 - 42/8 is -241/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
50/21 = 50 × 8/21 × 8 = 400/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
42/8 = 42 × 21/8 × 21 = 882/168 - Subtract the two like fractions:
400/168 - 882/168 = 400 - 882/168 = -482/168 - After reducing the fraction, the answer is -241/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21-84/8 50/42-42/8 50/21-42/16 50/63-42/8 50/21-42/24 50/21-42/40 50/21-42/56