Answers

Add 70/42 and 18/20

1^st number: 1 28/42, 2^nd number: 18/20

70/42 + 18/20 is 77/30.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   70/42 = 70 × 10/42 × 10 = 700/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   18/20 = 18 × 21/20 × 21 = 378/420
4. Add the two like fractions:
   700/420 + 378/420 = 700 + 378/420 = 1078/420
5. 1078/420 simplified gives 77/30
6. So, 70/42 + 18/20 = 77/30
   In mixed form: 217/30

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