Answers

Subtract 20/84 from 10/45

10/45 - 20/84 is -1/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 84 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 45 × 28 = 1260,
   10/45 = 10 × 28/45 × 28 = 280/1260
3. Likewise, for the 2nd fraction, since 84 × 15 = 1260,
   20/84 = 20 × 15/84 × 15 = 300/1260
4. Subtract the two like fractions:
   280/1260 - 300/1260 = 280 - 300/1260 = -20/1260
5. After reducing the fraction, the answer is -1/63

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