Answers

Add 84/18 and 90/21

1^st number: 4 12/18, 2^nd number: 4 6/21

84/18 + 90/21 is 188/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 21 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   84/18 = 84 × 7/18 × 7 = 588/126
3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
   90/21 = 90 × 6/21 × 6 = 540/126
4. Add the two like fractions:
   588/126 + 540/126 = 588 + 540/126 = 1128/126
5. 1128/126 simplified gives 188/21
6. So, 84/18 + 90/21 = 188/21
   In mixed form: 820/21

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