Let's analyze the problem from the image and determine the place values of the bolded digits.

1. a. $1 \, 345.87$ (the bold digit is $5$ in the ones place):
   Place value: $5 \times 1 = 5$ (ones place)

2. b. $6 \, 234 \, \mathbf{8}63.52$ (the bold digit is $8$ in the hundreds place):
   Place value: $8 \times 100 = 800$ (hundreds place)

3. c. $25 \, 872.26\mathbf{9}$ (the bold digit is $9$ in the thousandths place):
   Place value: $9 \times 0.001 = 0.009$ (thousandths place)

4. d. $73.1\mathbf{2}96$ (the bold digit is $2$ in the hundredths place):
   Place value: $2 \times 0.01 = 0.02$ (hundredths place)

5. e. $39.\mathbf{6}73$ (the bold digit is $6$ in the tenths place):
   Place value: $6 \times 0.1 = 0.6$ (tenths place)

6. f. $\mathbf{1} \, 835 \, 643.4286$ (the bold digit is $1$ in the millions place):
   Place value: $1 \times 1,000,000 = 1,000,000$ (millions place)

Would you like a more detailed breakdown of any specific place value or explanation?

Here are some related questions:

1. What is the place value of the digit 9 in 56,893.42?
2. How do you identify the place value of digits in decimal numbers?
3. What are the place values of digits after the decimal point?
4. How does the place value of digits change as you move from left to right?
5. How would you explain the concept of place value to someone new to math?

Tip: When moving left of the decimal point, each place value increases by a power of 10. When moving right, each place value decreases by a power of 10 (e.g., tenths, hundredths, thousandths).