Add 84/21 and 12/45
1st number: 4 0/21, 2nd number: 12/45
84/21 + 12/45 is 64/15.
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,
84/21 = 84 × 15/21 × 15 = 1260/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
12/45 = 12 × 7/45 × 7 = 84/315 - Add the two like fractions:
1260/315 + 84/315 = 1260 + 84/315 = 1344/315 - 1344/315 simplified gives 64/15
- So, 84/21 + 12/45 = 64/15
In mixed form: 44/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+24/45 84/42+12/45 84/21+12/90 84/21+36/45 84/63+12/45 84/21+60/45 84/21+84/45