Add 21/54 and 70/81
21/54 + 70/81 is 203/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 54 × 3 = 162,
21/54 = 21 × 3/54 × 3 = 63/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
70/81 = 70 × 2/81 × 2 = 140/162 - Add the two like fractions:
63/162 + 140/162 = 63 + 140/162 = 203/162 - So, 21/54 + 70/81 = 203/162
In mixed form: 141/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+70/81 63/54+70/81