Answers

Subtract 63/21 from 21/30

1^st number: 21/30, 2^nd number: 3 0/21

21/30 - 63/21 is -23/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 21 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 30 × 7 = 210,
   21/30 = 21 × 7/30 × 7 = 147/210
3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
   63/21 = 63 × 10/21 × 10 = 630/210
4. Subtract the two like fractions:
   147/210 - 630/210 = 147 - 630/210 = -483/210
5. After reducing the fraction, the answer is -23/10

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