Answers

Subtract 20/80 from 4/84

4/84 - 20/80 is -17/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 84 × 20 = 1680,
   4/84 = 4 × 20/84 × 20 = 80/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   20/80 = 20 × 21/80 × 21 = 420/1680
4. Subtract the two like fractions:
   80/1680 - 420/1680 = 80 - 420/1680 = -340/1680
5. After reducing the fraction, the answer is -17/84

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