Answers

Add 70/18 and 90/20

1^st number: 3 16/18, 2^nd number: 4 10/20

70/18 + 90/20 is 151/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 20 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 18 × 10 = 180,
   70/18 = 70 × 10/18 × 10 = 700/180
3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
   90/20 = 90 × 9/20 × 9 = 810/180
4. Add the two like fractions:
   700/180 + 810/180 = 700 + 810/180 = 1510/180
5. 1510/180 simplified gives 151/18
6. So, 70/18 + 90/20 = 151/18
   In mixed form: 87/18

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