Add 9/12 and 7/21
9/12 + 7/21 is 13/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Add the two like fractions:
63/84 + 28/84 = 63 + 28/84 = 91/84 - 91/84 simplified gives 13/12
- So, 9/12 + 7/21 = 13/12
In mixed form: 11/12
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