Add 12/7 and 21/45
1st number: 1 5/7, 2nd number: 21/45
12/7 + 21/45 is 229/105.
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,
12/7 = 12 × 45/7 × 45 = 540/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Add the two like fractions:
540/315 + 147/315 = 540 + 147/315 = 687/315 - 687/315 simplified gives 229/105
- So, 12/7 + 21/45 = 229/105
In mixed form: 219/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7+21/45 12/7+42/45 12/14+21/45 12/7+21/90 36/7+21/45 12/7+63/45 12/21+21/45 60/7+21/45 12/35+21/45 84/7+21/45 12/49+21/45