Answers

Add 40/21 and 15/72

1^st number: 1 19/21, 2^nd number: 15/72

40/21 + 15/72 is 355/168.

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,
   40/21 = 40 × 24/21 × 24 = 960/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   15/72 = 15 × 7/72 × 7 = 105/504
4. Add the two like fractions:
   960/504 + 105/504 = 960 + 105/504 = 1065/504
5. 1065/504 simplified gives 355/168
6. So, 40/21 + 15/72 = 355/168
   In mixed form: 219/168

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