Answers

Add 90/70 and 15/72

1^st number: 1 20/70, 2^nd number: 15/72

90/70 + 15/72 is 251/168.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 72 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 70 × 36 = 2520,
   90/70 = 90 × 36/70 × 36 = 3240/2520
3. Likewise, for the 2nd fraction, since 72 × 35 = 2520,
   15/72 = 15 × 35/72 × 35 = 525/2520
4. Add the two like fractions:
   3240/2520 + 525/2520 = 3240 + 525/2520 = 3765/2520
5. 3765/2520 simplified gives 251/168
6. So, 90/70 + 15/72 = 251/168
   In mixed form: 183/168

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