Answers

Add 84/63 and 21/80

1^st number: 1 21/63, 2^nd number: 21/80

84/63 + 21/80 is 383/240.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 80 is 5040
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5040
2. For the 1st fraction, since 63 × 80 = 5040,
   84/63 = 84 × 80/63 × 80 = 6720/5040
3. Likewise, for the 2nd fraction, since 80 × 63 = 5040,
   21/80 = 21 × 63/80 × 63 = 1323/5040
4. Add the two like fractions:
   6720/5040 + 1323/5040 = 6720 + 1323/5040 = 8043/5040
5. 8043/5040 simplified gives 383/240
6. So, 84/63 + 21/80 = 383/240
   In mixed form: 1143/240

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