Operations on a Number Line

Mr. Buffington teaches how to add and subtract using a number line. The lesson covers adding positive and negative numbers, explaining that adding moves right on the line, while subtracting moves left. Adding negatives decreases value, while subtracting negatives increases it. Examples illustrate these concepts, emphasizing that subtracting a negative is like adding a positive. The lesson concludes with a recap of these principles.

What is the result of adding 1 and 2 on a number line?

• 4

• 1

• 2

• 3

If you start at -1 and add -2 on a number line, where do you end up?

• -4

• -3

• -2

• -1

What happens when you add a positive number to a negative number?

• The value remains the same

• The value always decreases

• The value can increase or decrease

• The value always increases

What is the result of 1 minus 2 on a number line?

• 1

• -1

• -2

• 2

If you start at -2 and subtract 2, where do you end up?

• -1

• -4

• -2

• 0

What is the result of subtracting 35 from 20 on a number line?

• -15

• 15

• 55

• -55

If you start at 10 and take away -15, where do you end up?

• 15

• 5

• 25

• -5

What is the result of -4 minus -3?

• -7

• -1

• 1

• 7

If you start at -45 and take away -20, where do you end up?

• -65

• -25

• -35

• -15

What happens when you subtract a negative number?

• The value becomes zero

• The value decreases

• The value remains the same

• The value increases