Answers

Subtract 20/24 from 20/42

20/42 - 20/24 is -5/14.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 24 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 42 × 4 = 168,
   20/42 = 20 × 4/42 × 4 = 80/168
3. Likewise, for the 2nd fraction, since 24 × 7 = 168,
   20/24 = 20 × 7/24 × 7 = 140/168
4. Subtract the two like fractions:
   80/168 - 140/168 = 80 - 140/168 = -60/168
5. After reducing the fraction, the answer is -5/14

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