Answers

Subtract 25/80 from 63/42

1^st number: 1 21/42, 2^nd number: 25/80

63/42 - 25/80 is 19/16.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   63/42 = 63 × 40/42 × 40 = 2520/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   25/80 = 25 × 21/80 × 21 = 525/1680
4. Subtract the two like fractions:
   2520/1680 - 525/1680 = 2520 - 525/1680 = 1995/1680
5. After reducing the fraction, the answer is 19/16
6. In mixed form: 13/16

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