Answers

Subtract 42/60 from 21/63

21/63 - 42/60 is -11/30.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 60 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 63 × 20 = 1260,
   21/63 = 21 × 20/63 × 20 = 420/1260
3. Likewise, for the 2nd fraction, since 60 × 21 = 1260,
   42/60 = 42 × 21/60 × 21 = 882/1260
4. Subtract the two like fractions:
   420/1260 - 882/1260 = 420 - 882/1260 = -462/1260
5. After reducing the fraction, the answer is -11/30

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