Answers

Subtract 4/72 from 1/90

1/90 - 4/72 is -2/45.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 90 × 4 = 360,
   1/90 = 1 × 4/90 × 4 = 4/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   4/72 = 4 × 5/72 × 5 = 20/360
4. Subtract the two like fractions:
   4/360 - 20/360 = 4 - 20/360 = -16/360
5. After reducing the fraction, the answer is -2/45

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