Answers

Subtract 81/56 from 42/80

1^st number: 42/80, 2^nd number: 1 25/56

42/80 - 81/56 is -129/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 56 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   42/80 = 42 × 7/80 × 7 = 294/560
3. Likewise, for the 2nd fraction, since 56 × 10 = 560,
   81/56 = 81 × 10/56 × 10 = 810/560
4. Subtract the two like fractions:
   294/560 - 810/560 = 294 - 810/560 = -516/560
5. After reducing the fraction, the answer is -129/140

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