Answers

Add 42/75 and 21/20

1^st number: 42/75, 2^nd number: 1 1/20

42/75 + 21/20 is 161/100.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 20 is 300
   
   Next, find the equivalent fraction of both fractional numbers with denominator 300
2. For the 1st fraction, since 75 × 4 = 300,
   42/75 = 42 × 4/75 × 4 = 168/300
3. Likewise, for the 2nd fraction, since 20 × 15 = 300,
   21/20 = 21 × 15/20 × 15 = 315/300
4. Add the two like fractions:
   168/300 + 315/300 = 168 + 315/300 = 483/300
5. 483/300 simplified gives 161/100
6. So, 42/75 + 21/20 = 161/100
   In mixed form: 161/100

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