Add 21/45 and 1/12
21/45 + 1/12 is 11/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
1/12 = 1 × 15/12 × 15 = 15/180 - Add the two like fractions:
84/180 + 15/180 = 84 + 15/180 = 99/180 - 99/180 simplified gives 11/20
- So, 21/45 + 1/12 = 11/20
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