Addition: Addition and subtraction with regrouping

To solve this problem, let's follow the steps:

• Step 1: Identify the numbers that need to be added. In this case, they are $4$ and $8$.
• Step 2: Apply the addition operation to those numbers: $4 + 8$.
• Step 3: Perform the calculation. Adding those numbers gives us: $4 + 8 = 12$.

Therefore, the total number of units when we add 4 units to 8 units is $\mathbf{12}$.

To solve this problem, we will follow these steps:

• Step 1: Identify the numbers given in the problem.
• Step 2: Use addition to find the sum of these numbers.
• Step 3: Verify that the sum corresponds to one of the answer choices.

Now, let's work through each step:
Step 1: The problem gives us 3 units and 9 units.
Step 2: We'll use the addition operation.
$3 + 9 = 12$
Step 3: Check the given choices to ensure our answer, 12, matches one of them.

Therefore, the solution to the problem is $12$.

To solve the problem of finding the sum of 6 units and 7 units, we follow these steps:

• Step 1: Identify the numbers to be added. Here, they are 6 and 7.
• Step 2: Use the addition operation. We need to add the two numbers together: $6 + 7$.

Let's perform the addition:

$6 + 7 = 13$

Therefore, the sum of 6 units and 7 units is $13$.

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information and numbers to add.
• Step 2: Perform the addition accurately.
• Step 3: Match the calculated total with the given answer choices to confirm the correct answer.

Now, let's work through each step:
Step 1: The problem provides us with two sets of blocks, each containing 7 blocks. We need to find the total number of blocks after adding them together.
Step 2: Using the formula for addition, add the two sets of blocks: $7 + 7$. Performing this addition gives us:
$7 + 7 = 14$ Step 3: Compare this result with the given choices: the correct answer is indeed $14$, which matches choice $\text{id}=1$.

Therefore, the solution to the problem is $14$.

To solve this problem, we'll follow these steps:

• Identify the two numbers to be added: 5 and 6.
• Add these two numbers together using basic arithmetic.

Let's work through the solution step-by-step:
We need to calculate $5 + 6$. The operation involves simple addition:
$5 + 6 = 11$

Therefore, the result is $11 \text{ units}$.

Considering the provided multiple-choice answers, we check:

• corresponds to

  $11 \text{ units}$

The correct choice is Option 3.