Subtract 81/5 from 45/42
1st number: 1 3/42, 2nd number: 16 1/5
45/42 - 81/5 is -1059/70.
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,
45/42 = 45 × 5/42 × 5 = 225/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
81/5 = 81 × 42/5 × 42 = 3402/210 - Subtract the two like fractions:
225/210 - 3402/210 = 225 - 3402/210 = -3177/210 - After reducing the fraction, the answer is -1059/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-81/5 45/84-81/5 45/42-81/10 45/42-81/15 45/42-81/25 45/42-81/35