Add 21/7 and 84/45
1st number: 3 0/7, 2nd number: 1 39/45
21/7 + 84/45 is 73/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
21/7 = 21 × 45/7 × 45 = 945/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
84/45 = 84 × 7/45 × 7 = 588/315 - Add the two like fractions:
945/315 + 588/315 = 945 + 588/315 = 1533/315 - 1533/315 simplified gives 73/15
- So, 21/7 + 84/45 = 73/15
In mixed form: 413/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+84/45 21/14+84/45 21/7+84/90 63/7+84/45 21/35+84/45 21/49+84/45