Answers

Add 20/21 and 75/72

1^st number: 20/21, 2^nd number: 1 3/72

20/21 + 75/72 is 335/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 21 × 24 = 504,
   20/21 = 20 × 24/21 × 24 = 480/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   75/72 = 75 × 7/72 × 7 = 525/504
4. Add the two like fractions:
   480/504 + 525/504 = 480 + 525/504 = 1005/504
5. 1005/504 simplified gives 335/168
6. So, 20/21 + 75/72 = 335/168
   In mixed form: 1167/168

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