**Place Value Chart**

To arrange the given numbers in descending order, we can use a place value chart. A place value chart helps us understand the value of each digit in a number based on its position. The chart includes the following place values:

- **Ten Thousands**
- **Thousands**
- **Hundreds**
- **Tens**
- **Ones**

**Arranging the Numbers**

Let's arrange the given numbers in descending order using the place value chart:

1. **128435**
- Ten Thousands: 1
- Thousands: 2
- Hundreds: 8
- Tens: 4
- Ones: 3

2. **10835**
- Ten Thousands: 0
- Thousands: 1
- Hundreds: 0
- Tens: 8
- Ones: 3

3. **21354**
- Ten Thousands: 0
- Thousands: 2
- Hundreds: 1
- Tens: 3
- Ones: 4

4. **6348**
- Ten Thousands: 0
- Thousands: 0
- Hundreds: 6
- Tens: 3
- Ones: 4

5. **25840**
- Ten Thousands: 2
- Thousands: 5
- Hundreds: 8
- Tens: 4
- Ones: 0

**Descending Order**

Now that we have broken down the numbers into their place values, let's arrange them in descending order:

1. **128435**
2. **25840**
3. **21354**
4. **6348**
5. **10835**

Therefore, the given numbers arranged in descending order are 128435, 25840, 21354, 6348, and 10835.

Place value chart is given by
Samacheer Kalvi 6th Maths Term 1 Chapter 1 Numbers Ex 1.2 Q4
The number with more digits is the greater number
Step 1: 128435 is the larger number and 6348 is the least number
Step 2: For the remaining 5 digit numbers we can compare the left-most digits and find 25840 > 21354 > 10835.
The descending order:
128435 > 25840 > 21354 > 10835 > 6348