Add 20/21 and 4/20
20/21 + 4/20 is 121/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
20/21 = 20 × 20/21 × 20 = 400/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
4/20 = 4 × 21/20 × 21 = 84/420 - Add the two like fractions:
400/420 + 84/420 = 400 + 84/420 = 484/420 - 484/420 simplified gives 121/105
- So, 20/21 + 4/20 = 121/105
In mixed form: 116/105
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