Answers

Subtract 84/12 from 21/45

1^st number: 21/45, 2^nd number: 7 0/12

21/45 - 84/12 is -98/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 12 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 45 × 4 = 180,
   21/45 = 21 × 4/45 × 4 = 84/180
3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
   84/12 = 84 × 15/12 × 15 = 1260/180
4. Subtract the two like fractions:
   84/180 - 1260/180 = 84 - 1260/180 = -1176/180
5. After reducing the fraction, the answer is -98/15

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