Answers

Subtract 28/80 from 2/42

2/42 - 28/80 is -127/420.

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,
   2/42 = 2 × 40/42 × 40 = 80/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   28/80 = 28 × 21/80 × 21 = 588/1680
4. Subtract the two like fractions:
   80/1680 - 588/1680 = 80 - 588/1680 = -508/1680
5. After reducing the fraction, the answer is -127/420

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