Answers

Add 4/84 and 72/20

1^st number: 4/84, 2^nd number: 3 12/20

4/84 + 72/20 is 383/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   4/84 = 4 × 5/84 × 5 = 20/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   72/20 = 72 × 21/20 × 21 = 1512/420
4. Add the two like fractions:
   20/420 + 1512/420 = 20 + 1512/420 = 1532/420
5. 1532/420 simplified gives 383/105
6. So, 4/84 + 72/20 = 383/105
   In mixed form: 368/105

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