Integer Multiplication
1. Stating the problem: We will multiply different pairs of integers to understand the multiplication process.
2. Example 1: Multiply $3$ and $4$.
$$3 \times 4 = 12$$
Multiplying $3$ by $4$ means adding $3$ four times or adding $4$ three times.
3. Example 2: Multiply $-5$ and $6$.
$$-5 \times 6 = -30$$
A negative times a positive integer results in a negative product.
4. Example 3: Multiply $-7$ and $-2$.
$$-7 \times -2 = 14$$
A negative times a negative integer results in a positive product.
5. Example 4: Multiply $0$ and $9$.
$$0 \times 9 = 0$$
Any integer multiplied by zero is zero.
These examples illustrate basic integer multiplication rules.