Add 21/42 and 8/28
21/42 + 8/28 is 11/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
8/28 = 8 × 3/28 × 3 = 24/84 - Add the two like fractions:
42/84 + 24/84 = 42 + 24/84 = 66/84 - 66/84 simplified gives 11/14
- So, 21/42 + 8/28 = 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+16/28 21/84+8/28 21/42+8/56 63/42+8/28 21/42+24/28 21/42+8/84 21/42+40/28 21/42+56/28