Add 5/21 and 12/27
5/21 + 12/27 is 43/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
5/21 = 5 × 9/21 × 9 = 45/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189 - Add the two like fractions:
45/189 + 84/189 = 45 + 84/189 = 129/189 - 129/189 simplified gives 43/63
- So, 5/21 + 12/27 = 43/63
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