Rewrite the given numbers after inserting commas at appropriate places as indicated. Also, names the different periods that are separated by the commas:
Indian system
(i) 724569 (ii) 2678932 (iii) 561209367

Answer

To rewrite the given numbers in the Indian numbering system, we will insert commas at the appropriate places and then name the different periods that are separated by the commas.

### Step-by-Step Solution:

**(i) For the number 724569:**
1. Start from the right and group the digits into periods. The first group is the ones, tens, and hundreds (3 digits), and the next group is the thousands (2 digits).
2. The grouping will be: 7, 24, 569.
3. Therefore, 724569 can be written as **7,24,569**.
4. Naming the periods:
- 7 (Crores)
- 24 (Lakhs)
- 569 (Thousands)

So, the final answer is: **7,24,569** (7 Lakhs, 24 Thousand, 569).

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**(ii) For the number 2678932:**
1. Again, start from the right and group the digits into periods: 2 (Crores), 6 (Lakhs), 78 (Thousands), and 932 (Units).
2. The grouping will be: 26, 78, 932.
3. Therefore, 2678932 can be written as **26,78,932**.
4. Naming the periods:
- 26 (Lakhs)
- 78 (Thousands)
- 932 (Units)

So, the final answer is: **26,78,932** (26 Lakhs, 78 Thousand, 932).

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**(iii) For the number 561209367:**
1. Start from the right and group the digits: 56 (Crores), 12 (Lakhs), 09 (Thousands), and 367 (Units).
2. The grouping will be: 56, 12, 09, 367.
3. Therefore, 561209367 can be written as **56,12,09,367**.
4. Naming the periods:
- 56 (Crores)
- 12 (Lakhs)
- 09 (Thousands)
- 367 (Units)

So, the final answer is: **56,12,09,367** (56 Crores, 12 Lakhs, 9 Thousand, 367).

### Summary of Answers:
1. **724569** → **7,24,569** (7 Lakhs, 24 Thousand, 569)
2. **2678932** → **26,78,932** (26 Lakhs, 78 Thousand, 932)
3. **561209367** → **56,12,09,367** (56 Crores, 12 Lakhs, 9 Thousand, 367)

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