Mastering Addition and Subtraction with Number Lines and Models

The video tutorial covers third-grade concepts of addition and subtraction. It begins with an introduction to these concepts, followed by a practical problem involving money where Carla adds and subtracts amounts to find her total savings. The tutorial then shifts to a Lego problem, using a strip diagram to determine the number of green bricks. The video emphasizes understanding operations and using visual aids like number lines and strip diagrams to solve problems.

How much money did Carla initially have?

• $40

• $418

• $438

• $398

How much money was added to Carla's savings?

• $398

• $418

• $20

• $40

What operation is performed first in solving Carla's problem?

• Addition

• Division

• Multiplication

• Subtraction

After buying the jersey, how much money does Carla have left?

• $20

• $438

• $398

• $418

How many red Legos are there in the toy tub?

• 102

• 42

• 22

• 38

How many blue Legos are there in the toy tub?

• 22

• 102

• 42

• 38

What is the total number of Legos in the toy tub?

• 22

• 42

• 102

• 38

How many green Legos are there?

• 22

• 102

• 42

• 38

What mathematical operation is used to find the number of green Legos?

• Addition

• Subtraction

• Multiplication

• Division

What is the purpose of a strip diagram in solving the Lego problem?

• To subtract numbers

• To multiply numbers

• To add numbers

• To find the relationship between different quantities