Add 21/12 and 9/42
1st number: 1 9/12, 2nd number: 9/42
21/12 + 9/42 is 55/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
21/12 = 21 × 7/12 × 7 = 147/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
9/42 = 9 × 2/42 × 2 = 18/84 - Add the two like fractions:
147/84 + 18/84 = 147 + 18/84 = 165/84 - 165/84 simplified gives 55/28
- So, 21/12 + 9/42 = 55/28
In mixed form: 127/28
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