Answers

Subtract 28/80 from 25/42

25/42 - 28/80 is 103/420.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   25/42 = 25 × 40/42 × 40 = 1000/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   28/80 = 28 × 21/80 × 21 = 588/1680
4. Subtract the two like fractions:
   1000/1680 - 588/1680 = 1000 - 588/1680 = 412/1680
5. After reducing the fraction, the answer is 103/420

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