Answers

Add 20/21 and 84/20

1^st number: 20/21, 2^nd number: 4 4/20

20/21 + 84/20 is 541/105.

Steps for adding fractions

1. 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
2. For the 1st fraction, since 21 × 20 = 420,
   20/21 = 20 × 20/21 × 20 = 400/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   84/20 = 84 × 21/20 × 21 = 1764/420
4. Add the two like fractions:
   400/420 + 1764/420 = 400 + 1764/420 = 2164/420
5. 2164/420 simplified gives 541/105
6. So, 20/21 + 84/20 = 541/105
   In mixed form: 516/105

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