19. Is 381 divisible by 3 or 5 ? 20. $$ 4,20,100,500 $$

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### Problem 19: Is 381 divisible by 3 or 5?

**Step 1: Check divisibility by 3.**
A number is divisible by 3 if the sum of its digits is divisible by 3.

- The digits of 381 are $$3$$, $$8$$, and $$1$$.
- Sum of the digits: $$3 + 8 + 1 = 12$$.

Now, check if $$12$$ is divisible by $$3$$:
- $$12 \div 3 = 4$$ (which is an integer).

Thus, $$381$$ is divisible by $$3$$.

**Step 2: Check divisibility by 5.**
A number is divisible by 5 if it ends in $$0$$ or $$5$$.

- The last digit of $$381$$ is $$1$$, which is neither $$0$$ nor $$5$$.

Thus, $$381$$ is not divisible by $$5$$.

### Conclusion for Problem 19:
- $$381$$ is divisible by $$3$$ but not by $$5$$.

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### Problem 20: $$4, 20, 100, 500$$

It seems like you want to check the divisibility of these numbers by $$3$$ and $$5$$. Let's check each number.

**Step 1: Check divisibility of each number by 3 and 5.**

1. **For $$4$$**:
   - Divisibility by $$3$$: $$4$$ is not divisible by $$3$$ (since $$4 \div 3$$ is not an integer).
   - Divisibility by $$5$$: $$4$$ is not divisible by $$5$$ (since it does not end in $$0$$ or $$5$$).

2. **For $$20$$**:
   - Divisibility by $$3$$: $$20$$ is not divisible by $$3$$ (since $$20 \div 3$$ is not an integer).
   - Divisibility by $$5$$: $$20$$ is divisible by $$5$$ (since it ends in $$0$$).

3. **For $$100$$**:
   - Divisibility by $$3$$: $$100$$ is not divisible by $$3$$ (since $$100 \div 3$$ is not an integer).
   - Divisibility by $$5$$: $$100$$ is divisible by $$5$$ (since it ends in $$0$$).

4. **For $$500$$**:
   - Divisibility by $$3$$: $$500$$ is not divisible by $$3$$ (since $$500 \div 3$$ is not an integer).
   - Divisibility by $$5$$: $$500$$ is divisible by $$5$$ (since it ends in $$0$$).

### Conclusion for Problem 20:
- $$4$$: Not divisible by $$3$$ or $$5$$.
- $$20$$: Not divisible by $$3$$, divisible by $$5$$.
- $$100$$: Not divisible by $$3$$, divisible by $$5$$.
- $$500$$: Not divisible by $$3$$, divisible by $$5$$.
- 381 is divisible by 3 but not by 5. - 4 is not divisible by 3 or 5. - 20 is not divisible by 3 but is divisible by 5. - 100 is not divisible by 3 but is divisible by 5. - 500 is not divisible by 3 but is divisible by 5.

19. Is 381 divisible by 3 or 5 ? 20. \( 4,20,100,500 \)

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