1. Let's solve a simple problem for kids: What is $2 + 3$? 2. The formula for addition is $a + b = c$, where $a$ and $b$ are numbers and $c$ is their sum. 3. Here, $a = 2$ and $b = 3$. 4. Add the numbers: $2 + 3 = 5$. 5. So, the answer is $5$. This means if you have 2 apples and get 3 more, you have 5 apples in total.