Answers

Subtract 21/70 from 12/63

12/63 - 21/70 is -23/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 63 × 10 = 630,
   12/63 = 12 × 10/63 × 10 = 120/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   21/70 = 21 × 9/70 × 9 = 189/630
4. Subtract the two like fractions:
   120/630 - 189/630 = 120 - 189/630 = -69/630
5. After reducing the fraction, the answer is -23/210

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