Answers

Add 90/12 and 64/90

1^st number: 7 6/12, 2^nd number: 64/90

90/12 + 64/90 is 739/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 12 × 15 = 180,
   90/12 = 90 × 15/12 × 15 = 1350/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   64/90 = 64 × 2/90 × 2 = 128/180
4. Add the two like fractions:
   1350/180 + 128/180 = 1350 + 128/180 = 1478/180
5. 1478/180 simplified gives 739/90
6. So, 90/12 + 64/90 = 739/90
   In mixed form: 819/90

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