Answers

Subtract 42/49 from 21/20

1^st number: 1 1/20, 2^nd number: 42/49

21/20 - 42/49 is 27/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 49 is 980
   
   Next, find the equivalent fraction of both fractional numbers with denominator 980
2. For the 1st fraction, since 20 × 49 = 980,
   21/20 = 21 × 49/20 × 49 = 1029/980
3. Likewise, for the 2nd fraction, since 49 × 20 = 980,
   42/49 = 42 × 20/49 × 20 = 840/980
4. Subtract the two like fractions:
   1029/980 - 840/980 = 1029 - 840/980 = 189/980
5. After reducing the fraction, the answer is 27/140

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