1. Let's start with a simple problem: Find the sum of 234 and 567. 2. The formula for addition is straightforward: $a + b = c$, where $a$ and $b$ are numbers, and $c$ is their sum. 3. Applying the formula: $234 + 567 = 801$. 4. So, the answer is 801. 5. Next problem: What is the product of 12 and 15? 6. The multiplication formula is $a \times b = c$. 7. Calculate: $12 \times 15 = 180$. 8. The answer is 180. 9. Another problem: If you have 20 apples and give away 7, how many apples remain? 10. Use subtraction: $a - b = c$. 11. Calculate: $20 - 7 = 13$. 12. So, 13 apples remain. These problems help practice basic addition, multiplication, and subtraction, which are key skills in grade 6 math.