Answers

Add 70/21 and 45/80

1^st number: 3 7/21, 2^nd number: 45/80

70/21 + 45/80 is 187/48.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 21 × 80 = 1680,
   70/21 = 70 × 80/21 × 80 = 5600/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   45/80 = 45 × 21/80 × 21 = 945/1680
4. Add the two like fractions:
   5600/1680 + 945/1680 = 5600 + 945/1680 = 6545/1680
5. 6545/1680 simplified gives 187/48
6. So, 70/21 + 45/80 = 187/48
   In mixed form: 343/48

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