Add 21/60 and 1/28
21/60 + 1/28 is 27/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
1/28 = 1 × 15/28 × 15 = 15/420 - Add the two like fractions:
147/420 + 15/420 = 147 + 15/420 = 162/420 - 162/420 simplified gives 27/70
- So, 21/60 + 1/28 = 27/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+1/28 21/60+2/28 21/60+1/56 63/60+1/28 21/60+3/28 21/60+1/84 21/60+5/28 21/60+7/28