Add 25/70 and 21/72
25/70 + 21/72 is 109/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
25/70 = 25 × 36/70 × 36 = 900/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
21/72 = 21 × 35/72 × 35 = 735/2520 - Add the two like fractions:
900/2520 + 735/2520 = 900 + 735/2520 = 1635/2520 - 1635/2520 simplified gives 109/168
- So, 25/70 + 21/72 = 109/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/70+21/72 25/70+42/72 75/70+21/72 25/70+63/72