Answers

Add 90/54 and 42/70

1^st number: 1 36/54, 2^nd number: 42/70

90/54 + 42/70 is 34/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 70 is 1890
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1890
2. For the 1st fraction, since 54 × 35 = 1890,
   90/54 = 90 × 35/54 × 35 = 3150/1890
3. Likewise, for the 2nd fraction, since 70 × 27 = 1890,
   42/70 = 42 × 27/70 × 27 = 1134/1890
4. Add the two like fractions:
   3150/1890 + 1134/1890 = 3150 + 1134/1890 = 4284/1890
5. 4284/1890 simplified gives 34/15
6. So, 90/54 + 42/70 = 34/15
   In mixed form: 24/15

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