Answers

Subtract 27/7 from 20/90

1^st number: 20/90, 2^nd number: 3 6/7

20/90 - 27/7 is -229/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 7 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   20/90 = 20 × 7/90 × 7 = 140/630
3. Likewise, for the 2nd fraction, since 7 × 90 = 630,
   27/7 = 27 × 90/7 × 90 = 2430/630
4. Subtract the two like fractions:
   140/630 - 2430/630 = 140 - 2430/630 = -2290/630
5. After reducing the fraction, the answer is -229/63

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