Add 3/20 and 3/42
3/20 + 3/42 is 31/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
3/20 = 3 × 21/20 × 21 = 63/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
3/42 = 3 × 10/42 × 10 = 30/420 - Add the two like fractions:
63/420 + 30/420 = 63 + 30/420 = 93/420 - 93/420 simplified gives 31/140
- So, 3/20 + 3/42 = 31/140
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