Answers

Add 72/70 and 15/90

1^st number: 1 2/70, 2^nd number: 15/90

72/70 + 15/90 is 251/210.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   72/70 = 72 × 9/70 × 9 = 648/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   15/90 = 15 × 7/90 × 7 = 105/630
4. Add the two like fractions:
   648/630 + 105/630 = 648 + 105/630 = 753/630
5. 753/630 simplified gives 251/210
6. So, 72/70 + 15/90 = 251/210
   In mixed form: 141/210

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