Add 64/21 and 40/8
1st number: 3 1/21, 2nd number: 5 0/8
64/21 + 40/8 is 169/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
64/21 = 64 × 8/21 × 8 = 512/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
40/8 = 40 × 21/8 × 21 = 840/168 - Add the two like fractions:
512/168 + 840/168 = 512 + 840/168 = 1352/168 - 1352/168 simplified gives 169/21
- So, 64/21 + 40/8 = 169/21
In mixed form: 81/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/21+80/8 64/42+40/8 64/21+40/16 64/63+40/8 64/21+40/24 64/21+40/56