Subtract 72/70 from 3/84
1st number: 3/84, 2nd number: 1 2/70
3/84 - 72/70 is -139/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
72/70 = 72 × 6/70 × 6 = 432/420 - Subtract the two like fractions:
15/420 - 432/420 = 15 - 432/420 = -417/420 - After reducing the fraction, the answer is -139/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-72/70 9/84-72/70 15/84-72/70 21/84-72/70