Answers

Subtract 16/60 from 21/90

21/90 - 16/60 is -1/30.

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,
   21/90 = 21 × 2/90 × 2 = 42/180
3. Likewise, for the 2nd fraction, since 60 × 3 = 180,
   16/60 = 16 × 3/60 × 3 = 48/180
4. Subtract the two like fractions:
   42/180 - 48/180 = 42 - 48/180 = -6/180
5. After reducing the fraction, the answer is -1/30

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