Answers

Subtract 20/42 from 35/40

35/40 - 20/42 is 67/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 42 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   35/40 = 35 × 21/40 × 21 = 735/840
3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
   20/42 = 20 × 20/42 × 20 = 400/840
4. Subtract the two like fractions:
   735/840 - 400/840 = 735 - 400/840 = 335/840
5. After reducing the fraction, the answer is 67/168

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