Answers

Add 45/70 and 90/12

1^st number: 45/70, 2^nd number: 7 6/12

45/70 + 90/12 is 57/7.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 12 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 70 × 6 = 420,
   45/70 = 45 × 6/70 × 6 = 270/420
3. Likewise, for the 2nd fraction, since 12 × 35 = 420,
   90/12 = 90 × 35/12 × 35 = 3150/420
4. Add the two like fractions:
   270/420 + 3150/420 = 270 + 3150/420 = 3420/420
5. 3420/420 simplified gives 57/7
6. So, 45/70 + 90/12 = 57/7
   In mixed form: 81/7

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