Answers

Add 48/42 and 21/80

1^st number: 1 6/42, 2^nd number: 21/80

48/42 + 21/80 is 787/560.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   48/42 = 48 × 40/42 × 40 = 1920/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   21/80 = 21 × 21/80 × 21 = 441/1680
4. Add the two like fractions:
   1920/1680 + 441/1680 = 1920 + 441/1680 = 2361/1680
5. 2361/1680 simplified gives 787/560
6. So, 48/42 + 21/80 = 787/560
   In mixed form: 1227/560

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