Answers

Add 9/84 and 63/70

9/84 + 63/70 is 141/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 70 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 70 × 6 = 420,
   63/70 = 63 × 6/70 × 6 = 378/420
4. Add the two like fractions:
   45/420 + 378/420 = 45 + 378/420 = 423/420
5. 423/420 simplified gives 141/140
6. So, 9/84 + 63/70 = 141/140
   In mixed form: 11/140

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