Answers

Subtract 45/15 from 90/72

1^st number: 1 18/72, 2^nd number: 3 0/15

90/72 - 45/15 is -7/4.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 15 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   90/72 = 90 × 5/72 × 5 = 450/360
3. Likewise, for the 2nd fraction, since 15 × 24 = 360,
   45/15 = 45 × 24/15 × 24 = 1080/360
4. Subtract the two like fractions:
   450/360 - 1080/360 = 450 - 1080/360 = -630/360
5. After reducing the fraction, the answer is -7/4

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