Answers

Add 10/20 and 90/45

1^st number: 10/20, 2^nd number: 2 0/45

10/20 + 90/45 is 5/2.

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,
   10/20 = 10 × 9/20 × 9 = 90/180
3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
   90/45 = 90 × 4/45 × 4 = 360/180
4. Add the two like fractions:
   90/180 + 360/180 = 90 + 360/180 = 450/180
5. 450/180 simplified gives 5/2
6. So, 10/20 + 90/45 = 5/2
   In mixed form: 21/2

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