Answers

Subtract 42/60 from 1/90

1/90 - 42/60 is -31/45.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 60 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 90 × 2 = 180,
   1/90 = 1 × 2/90 × 2 = 2/180
3. Likewise, for the 2nd fraction, since 60 × 3 = 180,
   42/60 = 42 × 3/60 × 3 = 126/180
4. Subtract the two like fractions:
   2/180 - 126/180 = 2 - 126/180 = -124/180
5. After reducing the fraction, the answer is -31/45

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