Answers

Add 24/42 and 21/90

24/42 + 21/90 is 169/210.

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,
   24/42 = 24 × 15/42 × 15 = 360/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   21/90 = 21 × 7/90 × 7 = 147/630
4. Add the two like fractions:
   360/630 + 147/630 = 360 + 147/630 = 507/630
5. 507/630 simplified gives 169/210
6. So, 24/42 + 21/90 = 169/210

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