Add 12/20 and 1/21
12/20 + 1/21 is 68/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
1/21 = 1 × 20/21 × 20 = 20/420 - Add the two like fractions:
252/420 + 20/420 = 252 + 20/420 = 272/420 - 272/420 simplified gives 68/105
- So, 12/20 + 1/21 = 68/105
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