Place Value Exercise: Write 423 as Hundreds + Tens + Units

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

• Step 1: Identify the number given, which is 423.
• Step 2: Break down the number into its hundreds, tens, and units components.
• Step 3: Verify the sum equals the original number.

Now, let's work through each step to solve the problem:

Step 1: The number provided is 423.

Step 2: Break down the number into hundreds, tens, and units:

• The hundreds place is occupied by the digit 4, meaning $4 \times 100 = 400$.
• The tens place is occupied by the digit 2, meaning $2 \times 10 = 20$.
• The units place is occupied by the digit 3, meaning $3 \times 1 = 3$.

Step 3: Verify the result by calculating the sum $400 + 20 + 3 = 423$.

Therefore, the correct addition exercise to make the number 423 is $400 + 20 + 3 = 423$.

Examining the multiple-choice options, the correct one is option 2: $400 + 20 + 3 = 423$.