Subtract 70/49 from 45/84
1st number: 45/84, 2nd number: 1 21/49
45/84 - 70/49 is -25/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 49 is 588
Next, find the equivalent fraction of both fractional numbers with denominator 588 - For the 1st fraction, since 84 × 7 = 588,
45/84 = 45 × 7/84 × 7 = 315/588 - Likewise, for the 2nd fraction, since 49 × 12 = 588,
70/49 = 70 × 12/49 × 12 = 840/588 - Subtract the two like fractions:
315/588 - 840/588 = 315 - 840/588 = -525/588 - After reducing the fraction, the answer is -25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-70/49 45/84-70/98