Answers

Add 70/84 and 80/40

1^st number: 70/84, 2^nd number: 2 0/40

70/84 + 80/40 is 17/6.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   70/84 = 70 × 10/84 × 10 = 700/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   80/40 = 80 × 21/40 × 21 = 1680/840
4. Add the two like fractions:
   700/840 + 1680/840 = 700 + 1680/840 = 2380/840
5. 2380/840 simplified gives 17/6
6. So, 70/84 + 80/40 = 17/6
   In mixed form: 25/6

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