Let's evaluate the least common multiples (LCM) for each pair of numbers:

1. LCM of 4 and 8: The factors of 4 are $4 = 2^2$ and the factors of 8 are $8 = 2^3$. The LCM takes the highest power of all prime factors, so the LCM is $2^3 = 8$.
   This statement is false (LCM is 8, not 16).

2. LCM of 6 and 10: The factors of 6 are $6 = 2 \times 3$ and the factors of 10 are $10 = 2 \times 5$. The LCM is found by taking the highest power of each prime factor:
   $LCM(6, 10) = 2 \times 3 \times 5 = 30$.
   This statement is true.

3. LCM of 4 and 10: The factors of 4 are $4 = 2^2$ and the factors of 10 are $10 = 2 \times 5$. The LCM is $2^2 \times 5 = 20$.
   This statement is false (LCM is 20, not 40).

4. LCM of 6 and 8: The factors of 6 are $6 = 2 \times 3$ and the factors of 8 are $8 = 2^3$. The LCM is $2^3 \times 3 = 24$.
   This statement is false (LCM is 24, not 48).

Conclusion:

The true statement is:
The least common multiple of 6 and 10 is 30.

Would you like any further details or explanations?

Here are 5 relative questions to expand this concept:

1. How do you find the greatest common divisor (GCD) of two numbers?
2. What is the relationship between GCD and LCM for two numbers?
3. How do you calculate the LCM of three numbers?
4. What are prime factorization and its role in finding the LCM?
5. Can the LCM of two numbers ever be smaller than one of the numbers?

Tip: The LCM of two numbers is always greater than or equal to the larger number.