Subtract 84/21 from 25/28
1st number: 25/28, 2nd number: 4 0/21
25/28 - 84/21 is -87/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
25/28 = 25 × 3/28 × 3 = 75/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
84/21 = 84 × 4/21 × 4 = 336/84 - Subtract the two like fractions:
75/84 - 336/84 = 75 - 336/84 = -261/84 - After reducing the fraction, the answer is -87/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/28-84/21 25/56-84/21 25/28-84/42 75/28-84/21 25/84-84/21 25/28-84/63