Subtract 63/70 from 8/81
8/81 - 63/70 is -649/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 70 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 81 × 70 = 5670,
8/81 = 8 × 70/81 × 70 = 560/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
63/70 = 63 × 81/70 × 81 = 5103/5670 - Subtract the two like fractions:
560/5670 - 5103/5670 = 560 - 5103/5670 = -4543/5670 - After reducing the fraction, the answer is -649/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/81-63/70 24/81-63/70 40/81-63/70 56/81-63/70