Add 21/30 and 5/28
21/30 + 5/28 is 123/140.
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,
5/28 = 5 × 15/28 × 15 = 75/420 - Add the two like fractions:
294/420 + 75/420 = 294 + 75/420 = 369/420 - 369/420 simplified gives 123/140
- So, 21/30 + 5/28 = 123/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+5/28 21/30+10/28 21/60+5/28 21/30+5/56 63/30+5/28 21/30+15/28 21/90+5/28 21/30+5/84 21/30+25/28 21/30+35/28