The Number Line

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.

**Remember:** arrow for first number starts from 0, arrow for second number starts from end of first arrow.

•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.

This is a positive number **and** it is the first number so the red arrow moves to the right starting from **0** (zero).

•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.

This is a positive number - but we are subtracting so the blue arrow moves to the * left* starting from the end of the red arrow.

d. DIFFERENCE: What is the difference?

•
Click on "Show Difference " to see it on the number line.

e. EQUATION: Write down the equation for the subtraction.

• Click on Show Equation to check your answer.

•Click on **Reset** to start over.

LFS with idea for number line by Megan Yanes and for pseudo-slider by Zen Biker Maniac - Created with GeoGebra