Add 3/21 and 64/45
1st number: 3/21, 2nd number: 1 19/45
3/21 + 64/45 is 493/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
3/21 = 3 × 15/21 × 15 = 45/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
64/45 = 64 × 7/45 × 7 = 448/315 - Add the two like fractions:
45/315 + 448/315 = 45 + 448/315 = 493/315 - So, 3/21 + 64/45 = 493/315
In mixed form: 1178/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+64/45 3/42+64/45 3/21+64/90 9/21+64/45 3/63+64/45 15/21+64/45