Add 3/21 and 7/80
3/21 + 7/80 is 129/560.
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,
3/21 = 3 × 80/21 × 80 = 240/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
7/80 = 7 × 21/80 × 21 = 147/1680 - Add the two like fractions:
240/1680 + 147/1680 = 240 + 147/1680 = 387/1680 - 387/1680 simplified gives 129/560
- So, 3/21 + 7/80 = 129/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+7/80 3/21+14/80 3/42+7/80 9/21+7/80 3/21+21/80 3/63+7/80 15/21+7/80 3/21+35/80 3/21+49/80