Add 21/15 and 4/7
1st number: 1 6/15, 2nd number: 4/7
21/15 + 4/7 is 69/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
21/15 = 21 × 7/15 × 7 = 147/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
4/7 = 4 × 15/7 × 15 = 60/105 - Add the two like fractions:
147/105 + 60/105 = 147 + 60/105 = 207/105 - 207/105 simplified gives 69/35
- So, 21/15 + 4/7 = 69/35
In mixed form: 134/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+4/7 21/15+8/7 21/30+4/7 21/15+4/14 63/15+4/7 21/15+12/7 21/45+4/7 21/15+4/21 21/15+20/7 21/75+4/7 21/15+4/35 21/15+28/7 21/15+4/49