Add 2/21 and 28/40
2/21 + 28/40 is 167/210.
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,
2/21 = 2 × 40/21 × 40 = 80/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
28/40 = 28 × 21/40 × 21 = 588/840 - Add the two like fractions:
80/840 + 588/840 = 80 + 588/840 = 668/840 - 668/840 simplified gives 167/210
- So, 2/21 + 28/40 = 167/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21+28/40 2/21+56/40 2/42+28/40 2/21+28/80 6/21+28/40 2/21+84/40 2/63+28/40 10/21+28/40 14/21+28/40