Answers

Add 15/20 and 72/70

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

15/20 + 72/70 is 249/140.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 70 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 20 × 7 = 140,
   15/20 = 15 × 7/20 × 7 = 105/140
3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
   72/70 = 72 × 2/70 × 2 = 144/140
4. Add the two like fractions:
   105/140 + 144/140 = 105 + 144/140 = 249/140
5. So, 15/20 + 72/70 = 249/140
   In mixed form: 1109/140

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