Making Change with a Number Line

Mrs. Wright teaches third graders how to calculate change using a number line and a part-part-whole model. The lesson involves a practical example where Moby buys a pencil for 65 cents and pays with a dollar. Students learn to count up from 65 cents to a dollar using a number line, adding increments to reach friendly numbers. The part-part-whole model is used to visualize the problem, and students calculate the total change of 35 cents.

What did Moby buy in the video?

• A book

• A pencil

• A notebook

• A backpack

How much did Moby pay for the pencil?

• 70 cents

• 35 cents

• 1 dollar

• 65 cents

What method does Mrs. Wright use to calculate the change?

• Subtraction

• Multiplication

• Number line

• Division

What is the first step in using the number line to find the change?

• Add 10 cents

• Subtract 65 cents

• Add 5 cents

• Add 20 cents

After adding 5 cents to 65 cents, what is the next increment added?

• 20 cents

• 15 cents

• 5 cents

• 10 cents

Which number is considered a 'friendly number' in the video?

• 100 cents

• 70 cents

• 90 cents

• 80 cents

What is the purpose of using an open number line according to Mrs. Wright?

• To make exact calculations

• To visualize the problem

• To teach subtraction

• To simplify addition

How many jumps of 10 cents are made after reaching 70 cents?

• Four

• One

• Three

• Two

How many total cents did Mrs. Wright add to reach one dollar?

• 40 cents

• 35 cents

• 45 cents

• 30 cents

What is the total amount of change Moby receives back?

• 65 cents

• 30 cents

• 35 cents

• 25 cents