Add 21/30 and 18/84
21/30 + 18/84 is 32/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
21/30 = 21 × 14/30 × 14 = 294/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Add the two like fractions:
294/420 + 90/420 = 294 + 90/420 = 384/420 - 384/420 simplified gives 32/35
- So, 21/30 + 18/84 = 32/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+18/84 21/30+36/84 21/60+18/84 63/30+18/84 21/30+54/84 21/90+18/84 21/30+90/84