Subtract 36/42 from 81/4
1st number: 20 1/4, 2nd number: 36/42
81/4 - 36/42 is 543/28.
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,
36/42 = 36 × 2/42 × 2 = 72/84 - Subtract the two like fractions:
1701/84 - 72/84 = 1701 - 72/84 = 1629/84 - After reducing the fraction, the answer is 543/28
- In mixed form: 1911/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4-72/42 81/8-36/42 81/4-36/84 81/12-36/42 81/20-36/42 81/28-36/42