Answers

Add 9/84 and 90/20

1^st number: 9/84, 2^nd number: 4 10/20

9/84 + 90/20 is 129/28.

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,
   9/84 = 9 × 5/84 × 5 = 45/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   90/20 = 90 × 21/20 × 21 = 1890/420
4. Add the two like fractions:
   45/420 + 1890/420 = 45 + 1890/420 = 1935/420
5. 1935/420 simplified gives 129/28
6. So, 9/84 + 90/20 = 129/28
   In mixed form: 417/28

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