Answers

Add 80/42 and 63/90

1^st number: 1 38/42, 2^nd number: 63/90

80/42 + 63/90 is 547/210.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   80/42 = 80 × 15/42 × 15 = 1200/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   63/90 = 63 × 7/90 × 7 = 441/630
4. Add the two like fractions:
   1200/630 + 441/630 = 1200 + 441/630 = 1641/630
5. 1641/630 simplified gives 547/210
6. So, 80/42 + 63/90 = 547/210
   In mixed form: 2127/210

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