Answers

Add 90/25 and 20/21

1^st number: 3 15/25, 2^nd number: 20/21

90/25 + 20/21 is 478/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 21 is 525
   
   Next, find the equivalent fraction of both fractional numbers with denominator 525
2. For the 1st fraction, since 25 × 21 = 525,
   90/25 = 90 × 21/25 × 21 = 1890/525
3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
   20/21 = 20 × 25/21 × 25 = 500/525
4. Add the two like fractions:
   1890/525 + 500/525 = 1890 + 500/525 = 2390/525
5. 2390/525 simplified gives 478/105
6. So, 90/25 + 20/21 = 478/105
   In mixed form: 458/105

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