Add 40/21 and 8/7
1st number: 1 19/21, 2nd number: 1 1/7
40/21 + 8/7 is 64/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
40/21 = 40 × 1/21 × 1 = 40/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
8/7 = 8 × 3/7 × 3 = 24/21 - Add the two like fractions:
40/21 + 24/21 = 40 + 24/21 = 64/21 - So, 40/21 + 8/7 = 64/21
In mixed form: 31/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+8/7 40/21+16/7 40/42+8/7 40/21+8/14 40/21+24/7 40/63+8/7 40/21+8/21 40/21+40/7 40/21+8/35 40/21+56/7 40/21+8/49