Add 7/21 and 10/15
7/21 + 10/15 is 1/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
7/21 = 7 × 5/21 × 5 = 35/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
10/15 = 10 × 7/15 × 7 = 70/105 - Add the two like fractions:
35/105 + 70/105 = 35 + 70/105 = 105/105 - 105/105 simplified gives 1/1
- So, 7/21 + 10/15 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+10/15 7/21+20/15 7/42+10/15 7/21+10/30 7/21+30/15 7/63+10/15 7/21+10/45 35/21+10/15 7/21+50/15 7/21+10/75 49/21+10/15 7/21+70/15