Answers

Add 7/42 and 72/21

1^st number: 7/42, 2^nd number: 3 9/21

7/42 + 72/21 is 151/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   7/42 = 7 × 1/42 × 1 = 7/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   72/21 = 72 × 2/21 × 2 = 144/42
4. Add the two like fractions:
   7/42 + 144/42 = 7 + 144/42 = 151/42
5. So, 7/42 + 72/21 = 151/42
   In mixed form: 325/42

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