1. **Stating the problem:** Calculate the product of the multiplication problems given: 6×4, 9×5, 9×8, 12×12, 3×5, 5×4, 6×5, 3×12, 8×8, 8×5, 7×6, 12×6, 4×8, 3×7, 7×5, and 4×12. 2. **Formula used:** Multiplication of two numbers $a$ and $b$ is given by $a \times b = c$, where $c$ is the product. 3. **Calculations:** - $6 \times 4 = 24$ - $9 \times 5 = 45$ - $9 \times 8 = 72$ - $12 \times 12 = 144$ - $3 \times 5 = 15$ - $5 \times 4 = 20$ - $6 \times 5 = 30$ - $3 \times 12 = 36$ - $8 \times 8 = 64$ - $8 \times 5 = 40$ - $7 \times 6 = 42$ - $12 \times 6 = 72$ - $4 \times 8 = 32$ - $3 \times 7 = 21$ - $7 \times 5 = 35$ - $4 \times 12 = 48$ 4. **Explanation:** Multiplication is repeated addition. For example, $6 \times 4$ means adding 6 four times: $6 + 6 + 6 + 6 = 24$. Each product is calculated similarly. 5. **Final answers:** - $6 \times 4 = 24$ - $9 \times 5 = 45$ - $9 \times 8 = 72$ - $12 \times 12 = 144$ - $3 \times 5 = 15$ - $5 \times 4 = 20$ - $6 \times 5 = 30$ - $3 \times 12 = 36$ - $8 \times 8 = 64$ - $8 \times 5 = 40$ - $7 \times 6 = 42$ - $12 \times 6 = 72$ - $4 \times 8 = 32$ - $3 \times 7 = 21$ - $7 \times 5 = 35$ - $4 \times 12 = 48$