Answers

Add 72/40 and 21/28

1^st number: 1 32/40, 2^nd number: 21/28

72/40 + 21/28 is 51/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 28 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 40 × 7 = 280,
   72/40 = 72 × 7/40 × 7 = 504/280
3. Likewise, for the 2nd fraction, since 28 × 10 = 280,
   21/28 = 21 × 10/28 × 10 = 210/280
4. Add the two like fractions:
   504/280 + 210/280 = 504 + 210/280 = 714/280
5. 714/280 simplified gives 51/20
6. So, 72/40 + 21/28 = 51/20
   In mixed form: 211/20

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