Answers

Subtract 18/70 from 7/90

7/90 - 18/70 is -113/630.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   7/90 = 7 × 7/90 × 7 = 49/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   18/70 = 18 × 9/70 × 9 = 162/630
4. Subtract the two like fractions:
   49/630 - 162/630 = 49 - 162/630 = -113/630

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