Answers

Subtract 16/54 from 21/40

21/40 - 16/54 is 247/1080.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 54 is 1080
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1080
2. For the 1st fraction, since 40 × 27 = 1080,
   21/40 = 21 × 27/40 × 27 = 567/1080
3. Likewise, for the 2nd fraction, since 54 × 20 = 1080,
   16/54 = 16 × 20/54 × 20 = 320/1080
4. Subtract the two like fractions:
   567/1080 - 320/1080 = 567 - 320/1080 = 247/1080

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