Answers

Subtract 2/84 from 42/80

42/80 - 2/84 is 421/840.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 84 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   42/80 = 42 × 21/80 × 21 = 882/1680
3. Likewise, for the 2nd fraction, since 84 × 20 = 1680,
   2/84 = 2 × 20/84 × 20 = 40/1680
4. Subtract the two like fractions:
   882/1680 - 40/1680 = 882 - 40/1680 = 842/1680
5. After reducing the fraction, the answer is 421/840

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