Final answer:
To solve the problem (6 thousands 4 tens) / 10, we need to understand the place value system. The answer is 6.4.
Step-by-step explanation:
To solve the problem (6 thousands 4 tens) / 10, we need to understand the place value system. In this problem, 6 thousands is equivalent to 60 tens, so we have (60 tens 4 tens) / 10. Adding the 60 tens and 4 tens, we get 64 tens. Dividing 64 tens by 10, we get 6.4. Therefore, the answer is a) 6.4.