To solve $51.9 \div 6$, you can follow these steps:

1. Write it out as a division: $51.9 \div 6$

2. Perform the division: Divide 51.9 by 6. You can either do this by long division or use a calculator.

   Using a calculator: $51.9 \div 6 = 8.65$

So, $51.9 \div 6 = 8.65$.

Would you like more details on how this division is done manually, or have any further questions?

Related questions:

1. How do you perform long division with decimals?
2. How would the result change if you divided 51.9 by 3 instead of 6?
3. What is the rule for dividing decimals by whole numbers?
4. How do you round the result of a division to the nearest whole number?
5. How can division of decimals be used in real-world situations?

Tip: To divide decimals, you can multiply both the numerator and denominator by the same power of 10 (to remove the decimal) before performing the division.