Subtract 1/42 from 81/4
1st number: 20 1/4, 2nd number: 1/42
81/4 - 1/42 is 1699/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
81/4 = 81 × 21/4 × 21 = 1701/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
1/42 = 1 × 2/42 × 2 = 2/84 - Subtract the two like fractions:
1701/84 - 2/84 = 1701 - 2/84 = 1699/84 - In mixed form: 2019/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4-2/42 81/8-1/42 81/4-1/84 81/4-3/42 81/12-1/42 81/4-5/42 81/20-1/42 81/4-7/42 81/28-1/42