Subtract 10/21 from 27/45
27/45 - 10/21 is 13/105.
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,
10/21 = 10 × 15/21 × 15 = 150/315 - Subtract the two like fractions:
189/315 - 150/315 = 189 - 150/315 = 39/315 - After reducing the fraction, the answer is 13/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/45-10/21 27/45-20/21 27/90-10/21 27/45-10/42 81/45-10/21 27/45-30/21 27/45-10/63 27/45-50/21 27/45-70/21