Add 72/81 and 21/36
72/81 + 21/36 is 53/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 36 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
72/81 = 72 × 4/81 × 4 = 288/324 - Likewise, for the 2nd fraction, since 36 × 9 = 324,
21/36 = 21 × 9/36 × 9 = 189/324 - Add the two like fractions:
288/324 + 189/324 = 288 + 189/324 = 477/324 - 477/324 simplified gives 53/36
- So, 72/81 + 21/36 = 53/36
In mixed form: 117/36
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