Add 21/84 and 25/72
21/84 + 25/72 is 43/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 84 × 6 = 504,
21/84 = 21 × 6/84 × 6 = 126/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
25/72 = 25 × 7/72 × 7 = 175/504 - Add the two like fractions:
126/504 + 175/504 = 126 + 175/504 = 301/504 - 301/504 simplified gives 43/72
- So, 21/84 + 25/72 = 43/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+25/72 21/84+50/72 63/84+25/72 21/84+75/72