Add 3/15 and 45/21
1st number: 3/15, 2nd number: 2 3/21
3/15 + 45/21 is 82/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
3/15 = 3 × 7/15 × 7 = 21/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
45/21 = 45 × 5/21 × 5 = 225/105 - Add the two like fractions:
21/105 + 225/105 = 21 + 225/105 = 246/105 - 246/105 simplified gives 82/35
- So, 3/15 + 45/21 = 82/35
In mixed form: 212/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/15+45/21 3/15+90/21 3/30+45/21 3/15+45/42 9/15+45/21 3/45+45/21 3/15+45/63 3/75+45/21 21/15+45/21