Subtract 7/21 from 27/40
27/40 - 7/21 is 41/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
27/40 = 27 × 21/40 × 21 = 567/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
7/21 = 7 × 40/21 × 40 = 280/840 - Subtract the two like fractions:
567/840 - 280/840 = 567 - 280/840 = 287/840 - After reducing the fraction, the answer is 41/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/40-7/21 27/40-14/21 27/80-7/21 27/40-7/42 81/40-7/21 27/40-7/63 27/40-35/21 27/40-49/21