The video tutorial explains how to perform calculations involving additions and subtractions using a number line. It provides step-by-step examples, demonstrating how to handle positive and negative numbers and how to interpret operation symbols. The tutorial emphasizes breaking down complex calculations into manageable steps, ensuring a clear understanding of the process.

What is the initial step when using a number line for calculations?

• Start at zero on the number line

• Identify the first number and place your finger on it

• Move to the right immediately

• Subtract the first number

When adding a positive number on a number line, which direction do you move?

• Left

• Right

• Up

• Down

What happens when you subtract a negative number on a number line?

• Move to the left

• Stay in the same position

• Move to the right

• Move down

How do you move on the number line when adding a negative number?

• Stay in the same position

• Move up

• Move to the left

• Move to the right

In the second example, what is the first operation performed after starting at 81?

• Subtract a positive number

• Add a positive number

• Add a negative number

• Subtract a negative number

What is the result of subtracting a positive number in the second example?

• Move to the right

• Stay in the same position

• Move to the left

• Move up

What is the final result of the second example calculation?

• 75

• 86

• 81

• 90