Answers

Add 28/21 and 20/60

1^st number: 1 7/21, 2^nd number: 20/60

28/21 + 20/60 is 5/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 60 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   28/21 = 28 × 20/21 × 20 = 560/420
3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
   20/60 = 20 × 7/60 × 7 = 140/420
4. Add the two like fractions:
   560/420 + 140/420 = 560 + 140/420 = 700/420
5. 700/420 simplified gives 5/3
6. So, 28/21 + 20/60 = 5/3
   In mixed form: 12/3

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