Answers

Subtract 7/40 from 28/81

28/81 - 7/40 is 553/3240.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 40 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 81 × 40 = 3240,
   28/81 = 28 × 40/81 × 40 = 1120/3240
3. Likewise, for the 2nd fraction, since 40 × 81 = 3240,
   7/40 = 7 × 81/40 × 81 = 567/3240
4. Subtract the two like fractions:
   1120/3240 - 567/3240 = 1120 - 567/3240 = 553/3240

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