Answers

Add 42/90 and 60/21

1^st number: 42/90, 2^nd number: 2 18/21

42/90 + 60/21 is 349/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 21 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   42/90 = 42 × 7/90 × 7 = 294/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   60/21 = 60 × 30/21 × 30 = 1800/630
4. Add the two like fractions:
   294/630 + 1800/630 = 294 + 1800/630 = 2094/630
5. 2094/630 simplified gives 349/105
6. So, 42/90 + 60/21 = 349/105
   In mixed form: 334/105

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