Answers

Subtract 16/21 from 2/4

2/4 - 16/21 is -11/42.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 4 × 21 = 84,
   2/4 = 2 × 21/4 × 21 = 42/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   16/21 = 16 × 4/21 × 4 = 64/84
4. Subtract the two like fractions:
   42/84 - 64/84 = 42 - 64/84 = -22/84
5. After reducing the fraction, the answer is -11/42

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