Answers

Add 90/70 and 15/20

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

90/70 + 15/20 is 57/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   90/70 = 90 × 2/70 × 2 = 180/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   15/20 = 15 × 7/20 × 7 = 105/140
4. Add the two like fractions:
   180/140 + 105/140 = 180 + 105/140 = 285/140
5. 285/140 simplified gives 57/28
6. So, 90/70 + 15/20 = 57/28
   In mixed form: 21/28

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