Answers

Add 25/42 and 28/20

1^st number: 25/42, 2^nd number: 1 8/20

25/42 + 28/20 is 419/210.

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,
   25/42 = 25 × 10/42 × 10 = 250/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   28/20 = 28 × 21/20 × 21 = 588/420
4. Add the two like fractions:
   250/420 + 588/420 = 250 + 588/420 = 838/420
5. 838/420 simplified gives 419/210
6. So, 25/42 + 28/20 = 419/210
   In mixed form: 1209/210

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