Answers

Add 25/75 and 21/18

1^st number: 25/75, 2^nd number: 1 3/18

25/75 + 21/18 is 3/2.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 18 is 450
   
   Next, find the equivalent fraction of both fractional numbers with denominator 450
2. For the 1st fraction, since 75 × 6 = 450,
   25/75 = 25 × 6/75 × 6 = 150/450
3. Likewise, for the 2nd fraction, since 18 × 25 = 450,
   21/18 = 21 × 25/18 × 25 = 525/450
4. Add the two like fractions:
   150/450 + 525/450 = 150 + 525/450 = 675/450
5. 675/450 simplified gives 3/2
6. So, 25/75 + 21/18 = 3/2
   In mixed form: 11/2

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