Answers

Subtract 20/45 from 49/42

1^st number: 1 7/42, 2^nd number: 20/45

49/42 - 20/45 is 13/18.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 45 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   49/42 = 49 × 15/42 × 15 = 735/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   20/45 = 20 × 14/45 × 14 = 280/630
4. Subtract the two like fractions:
   735/630 - 280/630 = 735 - 280/630 = 455/630
5. After reducing the fraction, the answer is 13/18

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