Answers

Subtract 21/84 from 7/10

7/10 - 21/84 is 9/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 10 × 42 = 420,
   7/10 = 7 × 42/10 × 42 = 294/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   21/84 = 21 × 5/84 × 5 = 105/420
4. Subtract the two like fractions:
   294/420 - 105/420 = 294 - 105/420 = 189/420
5. After reducing the fraction, the answer is 9/20

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