Answers

Subtract 25/18 from 42/70

1^st number: 42/70, 2^nd number: 1 7/18

42/70 - 25/18 is -71/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 18 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 70 × 9 = 630,
   42/70 = 42 × 9/70 × 9 = 378/630
3. Likewise, for the 2nd fraction, since 18 × 35 = 630,
   25/18 = 25 × 35/18 × 35 = 875/630
4. Subtract the two like fractions:
   378/630 - 875/630 = 378 - 875/630 = -497/630
5. After reducing the fraction, the answer is -71/90

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