Answers

Add 40/54 and 64/21

1^st number: 40/54, 2^nd number: 3 1/21

40/54 + 64/21 is 716/189.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 21 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   40/54 = 40 × 7/54 × 7 = 280/378
3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
   64/21 = 64 × 18/21 × 18 = 1152/378
4. Add the two like fractions:
   280/378 + 1152/378 = 280 + 1152/378 = 1432/378
5. 1432/378 simplified gives 716/189
6. So, 40/54 + 64/21 = 716/189
   In mixed form: 3149/189

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