Answers

Add 80/21 and 42/20

1^st number: 3 17/21, 2^nd number: 2 2/20

80/21 + 42/20 is 1241/210.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   80/21 = 80 × 20/21 × 20 = 1600/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   42/20 = 42 × 21/20 × 21 = 882/420
4. Add the two like fractions:
   1600/420 + 882/420 = 1600 + 882/420 = 2482/420
5. 2482/420 simplified gives 1241/210
6. So, 80/21 + 42/20 = 1241/210
   In mixed form: 5191/210

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