Answers

Add 90/20 and 28/45

1^st number: 4 10/20, 2^nd number: 28/45

90/20 + 28/45 is 461/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 45 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   90/20 = 90 × 9/20 × 9 = 810/180
3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
   28/45 = 28 × 4/45 × 4 = 112/180
4. Add the two like fractions:
   810/180 + 112/180 = 810 + 112/180 = 922/180
5. 922/180 simplified gives 461/90
6. So, 90/20 + 28/45 = 461/90
   In mixed form: 511/90

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