Answers

Add 90/84 and 35/15

1^st number: 1 6/84, 2^nd number: 2 5/15

90/84 + 35/15 is 143/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 15 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   90/84 = 90 × 5/84 × 5 = 450/420
3. Likewise, for the 2nd fraction, since 15 × 28 = 420,
   35/15 = 35 × 28/15 × 28 = 980/420
4. Add the two like fractions:
   450/420 + 980/420 = 450 + 980/420 = 1430/420
5. 1430/420 simplified gives 143/42
6. So, 90/84 + 35/15 = 143/42
   In mixed form: 317/42

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