Answers

Subtract 90/42 from 27/40

1^st number: 27/40, 2^nd number: 2 6/42

27/40 - 90/42 is -411/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 42 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   27/40 = 27 × 21/40 × 21 = 567/840
3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
   90/42 = 90 × 20/42 × 20 = 1800/840
4. Subtract the two like fractions:
   567/840 - 1800/840 = 567 - 1800/840 = -1233/840
5. After reducing the fraction, the answer is -411/280

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