Answers

Add 90/70 and 20/15

1^st number: 1 20/70, 2^nd number: 1 5/15

90/70 + 20/15 is 55/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 15 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 70 × 3 = 210,
   90/70 = 90 × 3/70 × 3 = 270/210
3. Likewise, for the 2nd fraction, since 15 × 14 = 210,
   20/15 = 20 × 14/15 × 14 = 280/210
4. Add the two like fractions:
   270/210 + 280/210 = 270 + 280/210 = 550/210
5. 550/210 simplified gives 55/21
6. So, 90/70 + 20/15 = 55/21
   In mixed form: 213/21

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