Answers

Subtract 21/70 from 20/36

20/36 - 21/70 is 23/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 70 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 36 × 35 = 1260,
   20/36 = 20 × 35/36 × 35 = 700/1260
3. Likewise, for the 2nd fraction, since 70 × 18 = 1260,
   21/70 = 21 × 18/70 × 18 = 378/1260
4. Subtract the two like fractions:
   700/1260 - 378/1260 = 700 - 378/1260 = 322/1260
5. After reducing the fraction, the answer is 23/90

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