Answers

Add 90/42 and 40/54

1^st number: 2 6/42, 2^nd number: 40/54

90/42 + 40/54 is 545/189.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 42 × 9 = 378,
   90/42 = 90 × 9/42 × 9 = 810/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   40/54 = 40 × 7/54 × 7 = 280/378
4. Add the two like fractions:
   810/378 + 280/378 = 810 + 280/378 = 1090/378
5. 1090/378 simplified gives 545/189
6. So, 90/42 + 40/54 = 545/189
   In mixed form: 2167/189

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