Answers

Subtract 40/49 from 20/45

20/45 - 40/49 is -164/441.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 49 is 2205
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2205
2. For the 1st fraction, since 45 × 49 = 2205,
   20/45 = 20 × 49/45 × 49 = 980/2205
3. Likewise, for the 2nd fraction, since 49 × 45 = 2205,
   40/49 = 40 × 45/49 × 45 = 1800/2205
4. Subtract the two like fractions:
   980/2205 - 1800/2205 = 980 - 1800/2205 = -820/2205
5. After reducing the fraction, the answer is -164/441

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