Answers

Add 90/21 and 60/45

1^st number: 4 6/21, 2^nd number: 1 15/45

90/21 + 60/45 is 118/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 45 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 21 × 15 = 315,
   90/21 = 90 × 15/21 × 15 = 1350/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
   60/45 = 60 × 7/45 × 7 = 420/315
4. Add the two like fractions:
   1350/315 + 420/315 = 1350 + 420/315 = 1770/315
5. 1770/315 simplified gives 118/21
6. So, 90/21 + 60/45 = 118/21
   In mixed form: 513/21

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