Add 10/21 and 18/28
10/21 + 18/28 is 47/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
18/28 = 18 × 3/28 × 3 = 54/84 - Add the two like fractions:
40/84 + 54/84 = 40 + 54/84 = 94/84 - 94/84 simplified gives 47/42
- So, 10/21 + 18/28 = 47/42
In mixed form: 15/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+18/28 10/21+36/28 10/42+18/28 10/21+18/56 30/21+18/28 10/21+54/28 10/63+18/28 10/21+18/84 50/21+18/28 10/21+90/28 70/21+18/28