Solve: 3×100,000 + 9×100 + 8×10 + 1 in Expanded Form

To solve the given problem, we need to evaluate the expression step-by-step.

Let's begin by calculating each term in the expression:

• The first term is $3 \times 100,000$. Calculating this, we get $300,000$.
• The second term is $9 \times 100$. Calculating this, we find $900$.
• The third term is $8 \times 10$. This results in $80$.
• The fourth term is $1 \times 1$, which gives $1$.

Now, let's sum these calculated values:

$300,000 + 900 + 80 + 1$

Let's calculate this step-by-step:

• $300,000 + 900 = 300,900$
• $300,900 + 80 = 300,980$
• Finally, $300,980 + 1 = 300,981$

The result of the expression is $300,981$.

Given the answer choices, choice 3 $300,981$ is indeed the correct one.

Therefore, the solution to the problem is $300,981$.