Answers

Subtract 9/80 from 90/72

1^st number: 1 18/72, 2^nd number: 9/80

90/72 - 9/80 is 91/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 72 × 10 = 720,
   90/72 = 90 × 10/72 × 10 = 900/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   9/80 = 9 × 9/80 × 9 = 81/720
4. Subtract the two like fractions:
   900/720 - 81/720 = 900 - 81/720 = 819/720
5. After reducing the fraction, the answer is 91/80
6. In mixed form: 111/80

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