Subtract 21/9 from 42/50
1st number: 42/50, 2nd number: 2 3/9
42/50 - 21/9 is -112/75.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 9 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 50 × 9 = 450,
42/50 = 42 × 9/50 × 9 = 378/450 - Likewise, for the 2nd fraction, since 9 × 50 = 450,
21/9 = 21 × 50/9 × 50 = 1050/450 - Subtract the two like fractions:
378/450 - 1050/450 = 378 - 1050/450 = -672/450 - After reducing the fraction, the answer is -112/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/50-21/9 42/50-42/9 42/50-21/18 42/50-63/9 42/50-21/27 42/50-21/45 42/50-21/63