Add 40/21 and 8/15
1st number: 1 19/21, 2nd number: 8/15
40/21 + 8/15 is 256/105.
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,
40/21 = 40 × 5/21 × 5 = 200/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
8/15 = 8 × 7/15 × 7 = 56/105 - Add the two like fractions:
200/105 + 56/105 = 200 + 56/105 = 256/105 - So, 40/21 + 8/15 = 256/105
In mixed form: 246/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+8/15 40/21+16/15 40/42+8/15 40/21+8/30 40/21+24/15 40/63+8/15 40/21+8/45 40/21+40/15 40/21+8/75 40/21+56/15