Add 3/21 and 70/72
3/21 + 70/72 is 281/252.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
3/21 = 3 × 24/21 × 24 = 72/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
70/72 = 70 × 7/72 × 7 = 490/504 - Add the two like fractions:
72/504 + 490/504 = 72 + 490/504 = 562/504 - 562/504 simplified gives 281/252
- So, 3/21 + 70/72 = 281/252
In mixed form: 129/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+70/72 3/42+70/72 9/21+70/72 3/63+70/72 15/21+70/72