Subtract 70/63 from 12/81
1st number: 12/81, 2nd number: 1 7/63
12/81 - 70/63 is -26/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 63 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
12/81 = 12 × 7/81 × 7 = 84/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
70/63 = 70 × 9/63 × 9 = 630/567 - Subtract the two like fractions:
84/567 - 630/567 = 84 - 630/567 = -546/567 - After reducing the fraction, the answer is -26/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/81-70/63 36/81-70/63 60/81-70/63 84/81-70/63