Answers

Subtract 40/49 from 42/84

42/84 - 40/49 is -31/98.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 49 is 588
   
   Next, find the equivalent fraction of both fractional numbers with denominator 588
2. For the 1st fraction, since 84 × 7 = 588,
   42/84 = 42 × 7/84 × 7 = 294/588
3. Likewise, for the 2nd fraction, since 49 × 12 = 588,
   40/49 = 40 × 12/49 × 12 = 480/588
4. Subtract the two like fractions:
   294/588 - 480/588 = 294 - 480/588 = -186/588
5. After reducing the fraction, the answer is -31/98

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