Answers

Subtract 81/70 from 18/25

1^st number: 18/25, 2^nd number: 1 11/70

18/25 - 81/70 is -153/350.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 70 is 350
   
   Next, find the equivalent fraction of both fractional numbers with denominator 350
2. For the 1st fraction, since 25 × 14 = 350,
   18/25 = 18 × 14/25 × 14 = 252/350
3. Likewise, for the 2nd fraction, since 70 × 5 = 350,
   81/70 = 81 × 5/70 × 5 = 405/350
4. Subtract the two like fractions:
   252/350 - 405/350 = 252 - 405/350 = -153/350

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