Add 21/80 and 9/84
21/80 + 9/84 is 207/560.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
21/80 = 21 × 21/80 × 21 = 441/1680 - Likewise, for the 2nd fraction, since 84 × 20 = 1680,
9/84 = 9 × 20/84 × 20 = 180/1680 - Add the two like fractions:
441/1680 + 180/1680 = 441 + 180/1680 = 621/1680 - 621/1680 simplified gives 207/560
- So, 21/80 + 9/84 = 207/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+9/84 21/80+18/84 63/80+9/84 21/80+27/84 21/80+45/84 21/80+63/84