Answers

Subtract 21/27 from 70/84

70/84 - 21/27 is 1/18.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 27 is 756
   
   Next, find the equivalent fraction of both fractional numbers with denominator 756
2. For the 1st fraction, since 84 × 9 = 756,
   70/84 = 70 × 9/84 × 9 = 630/756
3. Likewise, for the 2nd fraction, since 27 × 28 = 756,
   21/27 = 21 × 28/27 × 28 = 588/756
4. Subtract the two like fractions:
   630/756 - 588/756 = 630 - 588/756 = 42/756
5. After reducing the fraction, the answer is 1/18

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