Answers

Add 16/60 and 45/21

1^st number: 16/60, 2^nd number: 2 3/21

16/60 + 45/21 is 253/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 60 × 7 = 420,
   16/60 = 16 × 7/60 × 7 = 112/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   45/21 = 45 × 20/21 × 20 = 900/420
4. Add the two like fractions:
   112/420 + 900/420 = 112 + 900/420 = 1012/420
5. 1012/420 simplified gives 253/105
6. So, 16/60 + 45/21 = 253/105
   In mixed form: 243/105

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