Answers

Add 72/64 and 20/27

1^st number: 1 8/64, 2^nd number: 20/27

72/64 + 20/27 is 403/216.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 64 and 27 is 1728
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1728
2. For the 1st fraction, since 64 × 27 = 1728,
   72/64 = 72 × 27/64 × 27 = 1944/1728
3. Likewise, for the 2nd fraction, since 27 × 64 = 1728,
   20/27 = 20 × 64/27 × 64 = 1280/1728
4. Add the two like fractions:
   1944/1728 + 1280/1728 = 1944 + 1280/1728 = 3224/1728
5. 3224/1728 simplified gives 403/216
6. So, 72/64 + 20/27 = 403/216
   In mixed form: 1187/216

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