Answers

Subtract 7/80 from 42/90

42/90 - 7/80 is 91/240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 90 × 8 = 720,
   42/90 = 42 × 8/90 × 8 = 336/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   7/80 = 7 × 9/80 × 9 = 63/720
4. Subtract the two like fractions:
   336/720 - 63/720 = 336 - 63/720 = 273/720
5. After reducing the fraction, the answer is 91/240

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