Add 21/27 and 12/30
21/27 + 12/30 is 53/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 30 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
21/27 = 21 × 10/27 × 10 = 210/270 - Likewise, for the 2nd fraction, since 30 × 9 = 270,
12/30 = 12 × 9/30 × 9 = 108/270 - Add the two like fractions:
210/270 + 108/270 = 210 + 108/270 = 318/270 - 318/270 simplified gives 53/45
- So, 21/27 + 12/30 = 53/45
In mixed form: 18/45
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