Answers

Add 70/64 and 80/90

1^st number: 1 6/64, 2^nd number: 80/90

70/64 + 80/90 is 571/288.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 64 and 90 is 2880
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2880
2. For the 1st fraction, since 64 × 45 = 2880,
   70/64 = 70 × 45/64 × 45 = 3150/2880
3. Likewise, for the 2nd fraction, since 90 × 32 = 2880,
   80/90 = 80 × 32/90 × 32 = 2560/2880
4. Add the two like fractions:
   3150/2880 + 2560/2880 = 3150 + 2560/2880 = 5710/2880
5. 5710/2880 simplified gives 571/288
6. So, 70/64 + 80/90 = 571/288
   In mixed form: 1283/288

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