Subtract 70/21 from 27/45
1st number: 27/45, 2nd number: 3 7/21
27/45 - 70/21 is -41/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
27/45 = 27 × 7/45 × 7 = 189/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
70/21 = 70 × 15/21 × 15 = 1050/315 - Subtract the two like fractions:
189/315 - 1050/315 = 189 - 1050/315 = -861/315 - After reducing the fraction, the answer is -41/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/45-70/21 27/90-70/21 27/45-70/42 81/45-70/21 27/45-70/63