Answers

Subtract 21/10 from 75/84

1^st number: 75/84, 2^nd number: 2 1/10

75/84 - 21/10 is -169/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 10 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   75/84 = 75 × 5/84 × 5 = 375/420
3. Likewise, for the 2nd fraction, since 10 × 42 = 420,
   21/10 = 21 × 42/10 × 42 = 882/420
4. Subtract the two like fractions:
   375/420 - 882/420 = 375 - 882/420 = -507/420
5. After reducing the fraction, the answer is -169/140

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