Subtract 70/14 from 81/30
1st number: 2 21/30, 2nd number: 5 0/14
81/30 - 70/14 is -23/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 14 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
81/30 = 81 × 7/30 × 7 = 567/210 - Likewise, for the 2nd fraction, since 14 × 15 = 210,
70/14 = 70 × 15/14 × 15 = 1050/210 - Subtract the two like fractions:
567/210 - 1050/210 = 567 - 1050/210 = -483/210 - After reducing the fraction, the answer is -23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/60-70/14 81/30-70/28 81/90-70/14 81/30-70/42 81/30-70/98