Answers

Add 30/21 and 21/60

1^st number: 1 9/21, 2^nd number: 21/60

30/21 + 21/60 is 249/140.

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,
   30/21 = 30 × 20/21 × 20 = 600/420
3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
   21/60 = 21 × 7/60 × 7 = 147/420
4. Add the two like fractions:
   600/420 + 147/420 = 600 + 147/420 = 747/420
5. 747/420 simplified gives 249/140
6. So, 30/21 + 21/60 = 249/140
   In mixed form: 1109/140

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