Add 21/35 and 9/72
21/35 + 9/72 is 29/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 35 × 72 = 2520,
21/35 = 21 × 72/35 × 72 = 1512/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
9/72 = 9 × 35/72 × 35 = 315/2520 - Add the two like fractions:
1512/2520 + 315/2520 = 1512 + 315/2520 = 1827/2520 - 1827/2520 simplified gives 29/40
- So, 21/35 + 9/72 = 29/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+9/72 21/35+18/72 21/70+9/72 63/35+9/72 21/35+27/72 21/35+45/72 21/35+63/72