Add 21/30 and 2/28
21/30 + 2/28 is 27/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 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 28 × 15 = 420,
2/28 = 2 × 15/28 × 15 = 30/420 - Add the two like fractions:
294/420 + 30/420 = 294 + 30/420 = 324/420 - 324/420 simplified gives 27/35
- So, 21/30 + 2/28 = 27/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+2/28 21/30+4/28 21/60+2/28 21/30+2/56 63/30+2/28 21/30+6/28 21/90+2/28 21/30+2/84 21/30+10/28 21/30+14/28