Answers

Add 90/25 and 40/21

1^st number: 3 15/25, 2^nd number: 1 19/21

90/25 + 40/21 is 578/105.

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,
   40/21 = 40 × 25/21 × 25 = 1000/525
4. Add the two like fractions:
   1890/525 + 1000/525 = 1890 + 1000/525 = 2890/525
5. 2890/525 simplified gives 578/105
6. So, 90/25 + 40/21 = 578/105
   In mixed form: 553/105

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