Answers

Add 45/84 and 12/90

45/84 + 12/90 is 281/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 90 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 84 × 15 = 1260,
   45/84 = 45 × 15/84 × 15 = 675/1260
3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
   12/90 = 12 × 14/90 × 14 = 168/1260
4. Add the two like fractions:
   675/1260 + 168/1260 = 675 + 168/1260 = 843/1260
5. 843/1260 simplified gives 281/420
6. So, 45/84 + 12/90 = 281/420

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