Add 45/3 and 84/21
1st number: 15 0/3, 2nd number: 4 0/21
45/3 + 84/21 is 19/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
45/3 = 45 × 7/3 × 7 = 315/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
84/21 = 84 × 1/21 × 1 = 84/21 - Add the two like fractions:
315/21 + 84/21 = 315 + 84/21 = 399/21 - 399/21 simplified gives 19/1
- So, 45/3 + 84/21 = 19/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/3+84/21 45/6+84/21 45/3+84/42 45/9+84/21 45/3+84/63 45/15+84/21 45/21+84/21