Answers

Add 84/21 and 98/15

1^st number: 4 0/21, 2^nd number: 6 8/15

84/21 + 98/15 is 158/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 15 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   84/21 = 84 × 5/21 × 5 = 420/105
3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
   98/15 = 98 × 7/15 × 7 = 686/105
4. Add the two like fractions:
   420/105 + 686/105 = 420 + 686/105 = 1106/105
5. 1106/105 simplified gives 158/15
6. So, 84/21 + 98/15 = 158/15
   In mixed form: 108/15

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