Answers

Subtract 40/42 from 50/63

50/63 - 40/42 is -10/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   50/63 = 50 × 2/63 × 2 = 100/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   40/42 = 40 × 3/42 × 3 = 120/126
4. Subtract the two like fractions:
   100/126 - 120/126 = 100 - 120/126 = -20/126
5. After reducing the fraction, the answer is -10/63

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