Answers

Subtract 70/72 from 20/25

20/25 - 70/72 is -31/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 72 is 1800
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1800
2. For the 1st fraction, since 25 × 72 = 1800,
   20/25 = 20 × 72/25 × 72 = 1440/1800
3. Likewise, for the 2nd fraction, since 72 × 25 = 1800,
   70/72 = 70 × 25/72 × 25 = 1750/1800
4. Subtract the two like fractions:
   1440/1800 - 1750/1800 = 1440 - 1750/1800 = -310/1800
5. After reducing the fraction, the answer is -31/180

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