2. Scate the divisibitity tests for 3. 5 and 9 with an example for each.

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To determine whether a number is divisible by 3, 5, or 9, we can use specific divisibility tests. Here are the tests along with examples for each:

### Divisibility Test for 3
**Rule:** A number is divisible by 3 if the sum of its digits is divisible by 3.

**Example:** Consider the number 123.
- Sum of the digits: $$1 + 2 + 3 = 6$$
- Since 6 is divisible by 3, the number 123 is also divisible by 3.

### Divisibility Test for 5
**Rule:** A number is divisible by 5 if it ends in 0 or 5.

**Example:** Consider the number 45.
- The last digit is 5.
- Since it ends in 5, the number 45 is divisible by 5.

### Divisibility Test for 9
**Rule:** A number is divisible by 9 if the sum of its digits is divisible by 9.

**Example:** Consider the number 729.
- Sum of the digits: $$7 + 2 + 9 = 18$$
- Since 18 is divisible by 9, the number 729 is also divisible by 9.

### Summary
- **Divisibility by 3:** 123 (sum of digits = 6, divisible by 3)
- **Divisibility by 5:** 45 (last digit = 5, divisible by 5)
- **Divisibility by 9:** 729 (sum of digits = 18, divisible by 9)
- **Divisible by 3:** If the sum of the digits is divisible by 3 (e.g., 123). - **Divisible by 5:** If the number ends with 0 or 5 (e.g., 45). - **Divisible by 9:** If the sum of the digits is divisible by 9 (e.g., 729).

2. Scate the divisibitity tests for 3. 5 and 9 with an example for each.

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