Answers

Subtract 8/40 from 15/84

15/84 - 8/40 is -3/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   15/84 = 15 × 10/84 × 10 = 150/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   8/40 = 8 × 21/40 × 21 = 168/840
4. Subtract the two like fractions:
   150/840 - 168/840 = 150 - 168/840 = -18/840
5. After reducing the fraction, the answer is -3/140

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