Answers

Subtract 60/4 from 21/90

1^st number: 21/90, 2^nd number: 15 0/4

21/90 - 60/4 is -443/30.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 4 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 90 × 2 = 180,
   21/90 = 21 × 2/90 × 2 = 42/180
3. Likewise, for the 2nd fraction, since 4 × 45 = 180,
   60/4 = 60 × 45/4 × 45 = 2700/180
4. Subtract the two like fractions:
   42/180 - 2700/180 = 42 - 2700/180 = -2658/180
5. After reducing the fraction, the answer is -443/30

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