Add 7/21 and 70/28
1st number: 7/21, 2nd number: 2 14/28
7/21 + 70/28 is 17/6.
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,
7/21 = 7 × 4/21 × 4 = 28/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
70/28 = 70 × 3/28 × 3 = 210/84 - Add the two like fractions:
28/84 + 210/84 = 28 + 210/84 = 238/84 - 238/84 simplified gives 17/6
- So, 7/21 + 70/28 = 17/6
In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+70/28 7/42+70/28 7/21+70/56 7/63+70/28 7/21+70/84 35/21+70/28 49/21+70/28