Answers

Subtract 42/10 from 9/20

1^st number: 9/20, 2^nd number: 4 2/10

9/20 - 42/10 is -15/4.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 10 is 20
   
   Next, find the equivalent fraction of both fractional numbers with denominator 20
2. For the 1st fraction, since 20 × 1 = 20,
   9/20 = 9 × 1/20 × 1 = 9/20
3. Likewise, for the 2nd fraction, since 10 × 2 = 20,
   42/10 = 42 × 2/10 × 2 = 84/20
4. Subtract the two like fractions:
   9/20 - 84/20 = 9 - 84/20 = -75/20
5. After reducing the fraction, the answer is -15/4

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