Answers

Add 70/20 and 90/80

1^st number: 3 10/20, 2^nd number: 1 10/80

70/20 + 90/80 is 37/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 20 × 4 = 80,
   70/20 = 70 × 4/20 × 4 = 280/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   90/80 = 90 × 1/80 × 1 = 90/80
4. Add the two like fractions:
   280/80 + 90/80 = 280 + 90/80 = 370/80
5. 370/80 simplified gives 37/8
6. So, 70/20 + 90/80 = 37/8
   In mixed form: 45/8

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