Add 1/21 and 10/28
1/21 + 10/28 is 17/42.
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,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
10/28 = 10 × 3/28 × 3 = 30/84 - Add the two like fractions:
4/84 + 30/84 = 4 + 30/84 = 34/84 - 34/84 simplified gives 17/42
- So, 1/21 + 10/28 = 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+10/28 1/21+20/28 1/42+10/28 1/21+10/56 3/21+10/28 1/21+30/28 1/63+10/28 1/21+10/84 5/21+10/28 1/21+50/28 7/21+10/28 1/21+70/28