Answers

Add 98/21 and 42/90

1^st number: 4 14/21, 2^nd number: 42/90

98/21 + 42/90 is 77/15.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 21 × 30 = 630,
   98/21 = 98 × 30/21 × 30 = 2940/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   42/90 = 42 × 7/90 × 7 = 294/630
4. Add the two like fractions:
   2940/630 + 294/630 = 2940 + 294/630 = 3234/630
5. 3234/630 simplified gives 77/15
6. So, 98/21 + 42/90 = 77/15
   In mixed form: 52/15

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