Final answer:
Both Option A (81/100) and Option D (810/1000) are fractions that are equal to 0.81 because 810/1000 simplifies to 81/100.
Step-by-step explanation:
To find the fraction equal to 0.81, we can examine each option to determine which is equivalent:
- Option A: 81/100 is the decimal form of 81 divided by 100, which is 0.81.
- Option B: 8/10 is equal to 0.8, which is not exactly 0.81.
- Option C: 18/20 is equal to 0.9 when simplified (since 18 divided by 20 is the same as 9 divided by 10), which is also not 0.81.
- Option D: 810/1000 can be simplified by dividing both the numerator and the denominator by 10 to get 81/100, so it is also equal to 0.81.
Both Option A and Option D are correct because they can be simplified to 81/100, which equals 0.81.