Add 4/21 and 27/40
4/21 + 27/40 is 727/840.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
4/21 = 4 × 40/21 × 40 = 160/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
27/40 = 27 × 21/40 × 21 = 567/840 - Add the two like fractions:
160/840 + 567/840 = 160 + 567/840 = 727/840 - So, 4/21 + 27/40 = 727/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+27/40 4/21+54/40 4/42+27/40 4/21+27/80 12/21+27/40 4/21+81/40 4/63+27/40 20/21+27/40 28/21+27/40