Answers

Subtract 35/80 from 8/42

8/42 - 35/80 is -83/336.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   8/42 = 8 × 40/42 × 40 = 320/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   35/80 = 35 × 21/80 × 21 = 735/1680
4. Subtract the two like fractions:
   320/1680 - 735/1680 = 320 - 735/1680 = -415/1680
5. After reducing the fraction, the answer is -83/336

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