Subtract 30/21 from 5/84
1st number: 5/84, 2nd number: 1 9/21
5/84 - 30/21 is -115/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
5/84 = 5 × 1/84 × 1 = 5/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
30/21 = 30 × 4/21 × 4 = 120/84 - Subtract the two like fractions:
5/84 - 120/84 = 5 - 120/84 = -115/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/84-30/21 5/84-60/21 5/84-30/42 15/84-30/21 5/84-90/21 5/84-30/63 25/84-30/21 35/84-30/21