Answers

Subtract 63/40 from 21/27

1^st number: 21/27, 2^nd number: 1 23/40

21/27 - 63/40 is -287/360.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 40 is 1080
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1080
2. For the 1st fraction, since 27 × 40 = 1080,
   21/27 = 21 × 40/27 × 40 = 840/1080
3. Likewise, for the 2nd fraction, since 40 × 27 = 1080,
   63/40 = 63 × 27/40 × 27 = 1701/1080
4. Subtract the two like fractions:
   840/1080 - 1701/1080 = 840 - 1701/1080 = -861/1080
5. After reducing the fraction, the answer is -287/360

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