Add 12/72 and 40/21
1st number: 12/72, 2nd number: 1 19/21
12/72 + 40/21 is 29/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Add the two like fractions:
84/504 + 960/504 = 84 + 960/504 = 1044/504 - 1044/504 simplified gives 29/14
- So, 12/72 + 40/21 = 29/14
In mixed form: 21/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/72+40/21 12/72+80/21 12/72+40/42 36/72+40/21 12/72+40/63 60/72+40/21 84/72+40/21