Answers

Add 72/20 and 21/60

1^st number: 3 12/20, 2^nd number: 21/60

72/20 + 21/60 is 79/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 60 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 20 × 3 = 60,
   72/20 = 72 × 3/20 × 3 = 216/60
3. Likewise, for the 2nd fraction, since 60 × 1 = 60,
   21/60 = 21 × 1/60 × 1 = 21/60
4. Add the two like fractions:
   216/60 + 21/60 = 216 + 21/60 = 237/60
5. 237/60 simplified gives 79/20
6. So, 72/20 + 21/60 = 79/20
   In mixed form: 319/20

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