Subtract 45/84 from 28/70
28/70 - 45/84 is -19/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
28/70 = 28 × 6/70 × 6 = 168/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
45/84 = 45 × 5/84 × 5 = 225/420 - Subtract the two like fractions:
168/420 - 225/420 = 168 - 225/420 = -57/420 - After reducing the fraction, the answer is -19/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/70-45/84 28/70-90/84 84/70-45/84