Answers

Add 72/28 and 21/40

1^st number: 2 16/28, 2^nd number: 21/40

72/28 + 21/40 is 867/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 40 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 28 × 10 = 280,
   72/28 = 72 × 10/28 × 10 = 720/280
3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
   21/40 = 21 × 7/40 × 7 = 147/280
4. Add the two like fractions:
   720/280 + 147/280 = 720 + 147/280 = 867/280
5. So, 72/28 + 21/40 = 867/280
   In mixed form: 327/280

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