Answers

Subtract 20/90 from 75/42

1^st number: 1 33/42, 2^nd number: 20/90

75/42 - 20/90 is 197/126.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   75/42 = 75 × 15/42 × 15 = 1125/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   20/90 = 20 × 7/90 × 7 = 140/630
4. Subtract the two like fractions:
   1125/630 - 140/630 = 1125 - 140/630 = 985/630
5. After reducing the fraction, the answer is 197/126
6. In mixed form: 171/126

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