Subtract 1/4 from 81/42
1st number: 1 39/42, 2nd number: 1/4
81/42 - 1/4 is 47/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
81/42 = 81 × 2/42 × 2 = 162/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
1/4 = 1 × 21/4 × 21 = 21/84 - Subtract the two like fractions:
162/84 - 21/84 = 162 - 21/84 = 141/84 - After reducing the fraction, the answer is 47/28
- In mixed form: 119/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42-2/4 81/84-1/4 81/42-1/8 81/42-3/4 81/42-1/12 81/42-5/4 81/42-1/20 81/42-7/4 81/42-1/28