Two-Digit Addition with Regrouping Strategies

The video tutorial explains how to use regrouping to solve a problem involving stickers. It begins with a concrete model using rods and cubes, then moves to a pictorial model with place value charts, and finally applies an algorithm to solve the problem abstractly. Each method confirms that Kathy and Christina have a total of 122 stickers. The tutorial emphasizes understanding regrouping through different models to ensure comprehension.

How many cat stickers does Kathy have?

• 79

• 43

• 122

• 100

What is the first step in building a concrete model for addition?

• Drawing a place value chart

• Adding the numbers directly

• Building with rods and units

• Regrouping the ones

What mathematical operation are we performing with Kathy and Christina's stickers?

• Multiplication

• Addition

• Division

• Subtraction

How many ice cream stickers does Christina have?

• 100

• 79

• 43

• 122

What does regrouping allow us to do with the ones place?

• Multiply it

• Convert it into a ten

• Subtract it

• Ignore it

What does the concrete model use to represent tens and ones?

• Lines and dots

• Cubes and spheres

• Squares and circles

• Rods and units

In the pictorial model, how many tens do we have after regrouping?

• 22

• 12

• 10

• 2

What is the total number of stickers Kathy and Christina have together?

• 43

• 79

• 122

• 100

In the standard algorithm, what do we do when we have more than 9 in the ones place?

• Leave it as is

• Regroup to the tens place

• Subtract ten

• Divide by ten

What is the final step in solving the addition problem using the standard algorithm?

• Regrouping the hundreds

• Adding the tens column

• Writing the number sentence

• Counting the total stickers