Add 21/28 and 7/80
21/28 + 7/80 is 67/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 28 × 20 = 560,
21/28 = 21 × 20/28 × 20 = 420/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
7/80 = 7 × 7/80 × 7 = 49/560 - Add the two like fractions:
420/560 + 49/560 = 420 + 49/560 = 469/560 - 469/560 simplified gives 67/80
- So, 21/28 + 7/80 = 67/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+7/80 21/28+14/80 21/56+7/80 63/28+7/80 21/28+21/80 21/84+7/80 21/28+35/80 21/28+49/80