Subtract 9/30 from 18/84
18/84 - 9/30 is -3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
9/30 = 9 × 14/30 × 14 = 126/420 - Subtract the two like fractions:
90/420 - 126/420 = 90 - 126/420 = -36/420 - After reducing the fraction, the answer is -3/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84-9/30 18/84-18/30 18/84-9/60 54/84-9/30 18/84-27/30 18/84-9/90 90/84-9/30 18/84-45/30 18/84-63/30