Answers

Subtract 1/42 from 9/80

9/80 - 1/42 is 149/1680.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 42 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 80 × 21 = 1680,
   9/80 = 9 × 21/80 × 21 = 189/1680
3. Likewise, for the 2nd fraction, since 42 × 40 = 1680,
   1/42 = 1 × 40/42 × 40 = 40/1680
4. Subtract the two like fractions:
   189/1680 - 40/1680 = 189 - 40/1680 = 149/1680

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