Add 21/28 and 3/42
21/28 + 3/42 is 23/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
3/42 = 3 × 2/42 × 2 = 6/84 - Add the two like fractions:
63/84 + 6/84 = 63 + 6/84 = 69/84 - 69/84 simplified gives 23/28
- So, 21/28 + 3/42 = 23/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+3/42 21/28+6/42 21/56+3/42 21/28+3/84 63/28+3/42 21/28+9/42 21/84+3/42 21/28+15/42 21/28+21/42