Answers

Subtract 42/50 from 21/49

21/49 - 42/50 is -72/175.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 50 is 2450
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2450
2. For the 1st fraction, since 49 × 50 = 2450,
   21/49 = 21 × 50/49 × 50 = 1050/2450
3. Likewise, for the 2nd fraction, since 50 × 49 = 2450,
   42/50 = 42 × 49/50 × 49 = 2058/2450
4. Subtract the two like fractions:
   1050/2450 - 2058/2450 = 1050 - 2058/2450 = -1008/2450
5. After reducing the fraction, the answer is -72/175

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