Subtract 42/9 from 81/50
1st number: 1 31/50, 2nd number: 4 6/9
81/50 - 42/9 is -457/150.
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,
81/50 = 81 × 9/50 × 9 = 729/450 - Likewise, for the 2nd fraction, since 9 × 50 = 450,
42/9 = 42 × 50/9 × 50 = 2100/450 - Subtract the two like fractions:
729/450 - 2100/450 = 729 - 2100/450 = -1371/450 - After reducing the fraction, the answer is -457/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/50-84/9 81/50-42/18 81/50-42/27 81/50-42/45 81/50-42/63