Answers

Add 90/72 and 80/70

1^st number: 1 18/72, 2^nd number: 1 10/70

90/72 + 80/70 is 67/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 70 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 72 × 35 = 2520,
   90/72 = 90 × 35/72 × 35 = 3150/2520
3. Likewise, for the 2nd fraction, since 70 × 36 = 2520,
   80/70 = 80 × 36/70 × 36 = 2880/2520
4. Add the two like fractions:
   3150/2520 + 2880/2520 = 3150 + 2880/2520 = 6030/2520
5. 6030/2520 simplified gives 67/28
6. So, 90/72 + 80/70 = 67/28
   In mixed form: 211/28

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