Answers

Subtract 72/10 from 18/90

1^st number: 18/90, 2^nd number: 7 2/10

18/90 - 72/10 is -7/1.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 10 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 90 × 1 = 90,
   18/90 = 18 × 1/90 × 1 = 18/90
3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
   72/10 = 72 × 9/10 × 9 = 648/90
4. Subtract the two like fractions:
   18/90 - 648/90 = 18 - 648/90 = -630/90
5. After reducing the fraction, the answer is -7/1

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