Add 4/21 and 18/42
4/21 + 18/42 is 13/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
4/21 = 4 × 2/21 × 2 = 8/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
18/42 = 18 × 1/42 × 1 = 18/42 - Add the two like fractions:
8/42 + 18/42 = 8 + 18/42 = 26/42 - 26/42 simplified gives 13/21
- So, 4/21 + 18/42 = 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+18/42 4/21+36/42 4/42+18/42 4/21+18/84 12/21+18/42 4/21+54/42 4/63+18/42 20/21+18/42 4/21+90/42 28/21+18/42