Answers

Add 21/72 and 54/14

1^st number: 21/72, 2^nd number: 3 12/14

21/72 + 54/14 is 697/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 14 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 72 × 7 = 504,
   21/72 = 21 × 7/72 × 7 = 147/504
3. Likewise, for the 2nd fraction, since 14 × 36 = 504,
   54/14 = 54 × 36/14 × 36 = 1944/504
4. Add the two like fractions:
   147/504 + 1944/504 = 147 + 1944/504 = 2091/504
5. 2091/504 simplified gives 697/168
6. So, 21/72 + 54/14 = 697/168
   In mixed form: 425/168

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