Add 10/21 and 49/80
10/21 + 49/80 is 1829/1680.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
10/21 = 10 × 80/21 × 80 = 800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
49/80 = 49 × 21/80 × 21 = 1029/1680 - Add the two like fractions:
800/1680 + 1029/1680 = 800 + 1029/1680 = 1829/1680 - So, 10/21 + 49/80 = 1829/1680
In mixed form: 1149/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+49/80 10/21+98/80 10/42+49/80 30/21+49/80 10/63+49/80 50/21+49/80 70/21+49/80