Answers

Add 48/20 and 42/21

1^st number: 2 8/20, 2^nd number: 2 0/21

48/20 + 42/21 is 22/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   48/20 = 48 × 21/20 × 21 = 1008/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   42/21 = 42 × 20/21 × 20 = 840/420
4. Add the two like fractions:
   1008/420 + 840/420 = 1008 + 840/420 = 1848/420
5. 1848/420 simplified gives 22/5
6. So, 48/20 + 42/21 = 22/5
   In mixed form: 42/5

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