Add 5/15 and 40/21
1st number: 5/15, 2nd number: 1 19/21
5/15 + 40/21 is 47/21.
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,
5/15 = 5 × 7/15 × 7 = 35/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
40/21 = 40 × 5/21 × 5 = 200/105 - Add the two like fractions:
35/105 + 200/105 = 35 + 200/105 = 235/105 - 235/105 simplified gives 47/21
- So, 5/15 + 40/21 = 47/21
In mixed form: 25/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15+40/21 5/15+80/21 5/30+40/21 5/15+40/42 5/45+40/21 5/15+40/63 25/15+40/21 5/75+40/21 35/15+40/21