The video tutorial demonstrates how to model the addition of three-digit whole numbers using base ten blocks. It provides two examples: adding 254 and 249, and adding 342 and 389. The process involves adding the ones, tens, and hundreds place values, performing exchanges when sums reach ten or more, and carrying over blocks to the next place value. The tutorial emphasizes understanding the concept of place value and the physical representation of numbers using base ten blocks.

What is the main focus of the lesson introduced in the video?

• Addition of three-digit numbers using base ten blocks

• Multiplication of two-digit numbers

• Division of four-digit numbers

• Subtraction of three-digit numbers

When adding the ones place value, what do you do if the sum is ten or more?

• Subtract a ten-block

• Perform an exchange for a ten-block

• Ignore the extra blocks

• Add a hundred-block

In the first example, what is the result of adding the ones place values of 254 and 249?

• 12

• 11

• 13

• 14

What happens when the sum of the tens place value is ten or more?

• Perform an exchange for a one-hundred block

• Add another ten-block

• Subtract a ten-block

• Ignore the extra blocks

How many one-hundred blocks are there after adding the hundreds place values in the first example?

• Five

• Seven

• Four

• Six

In the second example, what is the sum of the ones place values of 342 and 389?

• 13

• 12

• 11

• 10

What is the result of adding the tens place values in the second example?

• 14

• 13

• 12

• 15

How many one-hundred blocks are there after adding the hundreds place values in the second example?

• Nine

• Six

• Seven

• Eight

What is the final sum of the numbers in the second example?

• 721

• 731

• 741

• 751

What is the purpose of using base ten blocks in this lesson?

• To make subtraction easier

• To complicate the calculation

• To avoid using paper

• To visualize the addition process