Add 21/40 and 6/21
21/40 + 6/21 is 227/280.
Steps for adding 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,
21/40 = 21 × 21/40 × 21 = 441/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
6/21 = 6 × 40/21 × 40 = 240/840 - Add the two like fractions:
441/840 + 240/840 = 441 + 240/840 = 681/840 - 681/840 simplified gives 227/280
- So, 21/40 + 6/21 = 227/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+6/21 21/40+12/21 21/80+6/21 21/40+6/42 63/40+6/21 21/40+18/21 21/40+6/63 21/40+30/21 21/40+42/21