Answers

Subtract 21/80 from 42/75

42/75 - 21/80 is 119/400.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 80 is 1200
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1200
2. For the 1st fraction, since 75 × 16 = 1200,
   42/75 = 42 × 16/75 × 16 = 672/1200
3. Likewise, for the 2nd fraction, since 80 × 15 = 1200,
   21/80 = 21 × 15/80 × 15 = 315/1200
4. Subtract the two like fractions:
   672/1200 - 315/1200 = 672 - 315/1200 = 357/1200
5. After reducing the fraction, the answer is 119/400

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