The video tutorial explains a simple subtraction problem involving marbles. Carl starts with 70 marbles, but 40 roll away after he trips. The tutorial uses visual aids to help viewers understand the subtraction process, ultimately showing that Carl has 30 marbles left. The video emphasizes visualizing the problem and performing basic arithmetic to find the solution.

How many marbles did Carl originally have in his bag?

• 50

• 60

• 80

• 70

What event caused Carl to lose some of his marbles?

• He gave them away

• He tripped on the sidewalk

• He dropped them in a park

• He sold them

How are the marbles grouped to help visualize the problem?

• Groups of 5

• Groups of 10

• Groups of 15

• Groups of 20

How many marbles rolled down the storm drain?

• 50

• 30

• 20

• 40

After losing some marbles, how many does Carl have left?

• 20

• 30

• 40

• 50

What mathematical operation is used to find out how many marbles Carl has left?

• Division

• Addition

• Multiplication

• Subtraction