John's Marble Problem Analysis

The video tutorial presents a word problem where John initially has 50 marbles but loses 10 when they roll down a storm drain. The problem is analyzed by understanding the given information and then solved using subtraction. A visual representation and subtraction sentence are used to demonstrate that John has 40 marbles left.

What event caused John to lose some of his marbles?

• He gave them away.

• He sold them.

• He tripped on the sidewalk.

• He dropped them in a river.

How many marbles did John initially have?

• 40

• 70

• 50

• 60

What is the first step in solving the problem according to the narrator?

• Ask a friend for help.

• Guess the answer.

• Count the marbles again.

• Think about what is known.

Which mathematical operation is used to find out how many marbles John has left?

• Addition

• Multiplication

• Subtraction

• Division

After solving the problem, how many marbles does John have left?

• 40

• 10

• 30

• 20