Answers

Add 42/21 and 48/30

1^st number: 2 0/21, 2^nd number: 1 18/30

42/21 + 48/30 is 18/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 30 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 21 × 10 = 210,
   42/21 = 42 × 10/21 × 10 = 420/210
3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
   48/30 = 48 × 7/30 × 7 = 336/210
4. Add the two like fractions:
   420/210 + 336/210 = 420 + 336/210 = 756/210
5. 756/210 simplified gives 18/5
6. So, 42/21 + 48/30 = 18/5
   In mixed form: 33/5

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