Subtract 9/84 from 21/35
21/35 - 9/84 is 69/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 35 × 12 = 420,
21/35 = 21 × 12/35 × 12 = 252/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
9/84 = 9 × 5/84 × 5 = 45/420 - Subtract the two like fractions:
252/420 - 45/420 = 252 - 45/420 = 207/420 - After reducing the fraction, the answer is 69/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-9/84 21/35-18/84 21/70-9/84 63/35-9/84 21/35-27/84 21/35-45/84 21/35-63/84