Add 21/7 and 12/72
1st number: 3 0/7, 2nd number: 12/72
21/7 + 12/72 is 19/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 7 × 72 = 504,
21/7 = 21 × 72/7 × 72 = 1512/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504 - Add the two like fractions:
1512/504 + 84/504 = 1512 + 84/504 = 1596/504 - 1596/504 simplified gives 19/6
- So, 21/7 + 12/72 = 19/6
In mixed form: 31/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+12/72 21/7+24/72 21/14+12/72 63/7+12/72 21/7+36/72 21/7+60/72 21/35+12/72 21/7+84/72 21/49+12/72