Answers

Add 80/84 and 5/35

80/84 + 5/35 is 23/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 35 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   80/84 = 80 × 5/84 × 5 = 400/420
3. Likewise, for the 2nd fraction, since 35 × 12 = 420,
   5/35 = 5 × 12/35 × 12 = 60/420
4. Add the two like fractions:
   400/420 + 60/420 = 400 + 60/420 = 460/420
5. 460/420 simplified gives 23/21
6. So, 80/84 + 5/35 = 23/21
   In mixed form: 12/21

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