Answers

Add 15/84 and 30/20

1^st number: 15/84, 2^nd number: 1 10/20

15/84 + 30/20 is 47/28.

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,
   15/84 = 15 × 5/84 × 5 = 75/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   30/20 = 30 × 21/20 × 21 = 630/420
4. Add the two like fractions:
   75/420 + 630/420 = 75 + 630/420 = 705/420
5. 705/420 simplified gives 47/28
6. So, 15/84 + 30/20 = 47/28
   In mixed form: 119/28

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