Answers

Add 45/12 and 80/70

1^st number: 3 9/12, 2^nd number: 1 10/70

45/12 + 80/70 is 137/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 70 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 12 × 35 = 420,
   45/12 = 45 × 35/12 × 35 = 1575/420
3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
   80/70 = 80 × 6/70 × 6 = 480/420
4. Add the two like fractions:
   1575/420 + 480/420 = 1575 + 480/420 = 2055/420
5. 2055/420 simplified gives 137/28
6. So, 45/12 + 80/70 = 137/28
   In mixed form: 425/28

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