Subtract 15/21 from 9/84
9/84 - 15/21 is -17/28.
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,
9/84 = 9 × 1/84 × 1 = 9/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Subtract the two like fractions:
9/84 - 60/84 = 9 - 60/84 = -51/84 - After reducing the fraction, the answer is -17/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/84-15/21 9/84-30/21 9/84-15/42 27/84-15/21 9/84-45/21 9/84-15/63 45/84-15/21 9/84-75/21 63/84-15/21