Answers

Subtract 7/80 from 21/75

21/75 - 7/80 is 77/400.

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,
   21/75 = 21 × 16/75 × 16 = 336/1200
3. Likewise, for the 2nd fraction, since 80 × 15 = 1200,
   7/80 = 7 × 15/80 × 15 = 105/1200
4. Subtract the two like fractions:
   336/1200 - 105/1200 = 336 - 105/1200 = 231/1200
5. After reducing the fraction, the answer is 77/400

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