Add 18/84 and 21/60
18/84 + 21/60 is 79/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Add the two like fractions:
90/420 + 147/420 = 90 + 147/420 = 237/420 - 237/420 simplified gives 79/140
- So, 18/84 + 21/60 = 79/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84+21/60 18/84+42/60 54/84+21/60 18/84+63/60 90/84+21/60