Add 72/12 and 8/21
1st number: 6 0/12, 2nd number: 8/21
72/12 + 8/21 is 134/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
72/12 = 72 × 7/12 × 7 = 504/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
8/21 = 8 × 4/21 × 4 = 32/84 - Add the two like fractions:
504/84 + 32/84 = 504 + 32/84 = 536/84 - 536/84 simplified gives 134/21
- So, 72/12 + 8/21 = 134/21
In mixed form: 68/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/12+16/21 72/24+8/21 72/12+8/42 72/12+24/21 72/36+8/21 72/12+8/63 72/12+40/21 72/60+8/21 72/12+56/21 72/84+8/21