Subtract 81/5 from 5/42
1st number: 5/42, 2nd number: 16 1/5
5/42 - 81/5 is -3377/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
5/42 = 5 × 5/42 × 5 = 25/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
81/5 = 81 × 42/5 × 42 = 3402/210 - Subtract the two like fractions:
25/210 - 3402/210 = 25 - 3402/210 = -3377/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42-81/5 5/84-81/5 5/42-81/10 15/42-81/5 5/42-81/15 25/42-81/5 5/42-81/25 35/42-81/5 5/42-81/35