a. SCALE: Set the scale of the number line that is:
• Type in a number >=1 and <=500.
• Then click on the Set Scale button.
• What do you want to do? Click on the button!
• Now click on Ready for First Number.
b. FIRST NUMBER: Click and drag the point on the red slider to the value of the first number.
• Now click on Ready for Second Number.
c. Second Number: Click and drag the point on the blue slider to the value of the second number.
d. OPERATION: What is the result?
• Click on "Show Result " to see it on the number line.
e. EQUATION: Write down the equation for the operation and then do the operation.
• Click on Show Equation to check your answer.
• Click on Reset to start over.