63820 = 60000 + 3000 + 800 + 20 + 0

Here are the numbers written in expanded form:

1. $63820 = 60000 + 3000 + 800 + 20 + 0$
2. $71040 = 70000 + 1000 + 0 + 40 + 0$
3. $29873 = 20000 + 9000 + 800 + 70 + 3$
4. $45501 = 40000 + 5000 + 500 + 0 + 1$
5. $91000 = 90000 + 1000 + 0 + 0 + 0$
6. $32496 = 30000 + 2000 + 400 + 90 + 6$
7. $10700 = 10000 + 0 + 700 + 0 + 0$
8. $91377 = 90000 + 1000 + 300 + 70 + 7$
9. $52086 = 50000 + 2000 + 0 + 80 + 6$

The place values of digit 3 in the given numbers are:

• In 63820, the digit 3 is in the thousands place, so its value is 3000.
• In 29873, the digit 3 is in the ones place, so its value is 3.
• In 32496, the digit 3 is in the ten thousands place, so its value is 30000.
• In 91377, the digit 3 is in the hundreds place, so its value is 300.

The place values of digit 3 are: $\boxed{\text{3000, 3, 30000, 300}}$