Answers

Subtract 90/5 from 45/72

1^st number: 45/72, 2^nd number: 18 0/5

45/72 - 90/5 is -139/8.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 5 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   45/72 = 45 × 5/72 × 5 = 225/360
3. Likewise, for the 2nd fraction, since 5 × 72 = 360,
   90/5 = 90 × 72/5 × 72 = 6480/360
4. Subtract the two like fractions:
   225/360 - 6480/360 = 225 - 6480/360 = -6255/360
5. After reducing the fraction, the answer is -139/8

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