Lesson: Subtracting (adding) Integers on a Number Line

Multiple Choice

Do you have your phone in the box, notebook out, and ready to take notes? ​

(you will need to take a picture and upload it at the end)

• YES I have my notebook out

• No, I know it means a bad grade

Subtracting (adding) Integers on a Number Line

Objective: Subtract integers on a number line by changing them to addition problems.

Math Response

WARM-UP: Write the addition equation for the problem shown on the number line.

Type answer here

Correct Answer: 4+-8=-4

Deg^°

Rad

​When the problem is addition, the second number in the expression tells you which direction you are counting.

ADDING Integers on a Number Line

​4 + ⁺5

​4 + ^-5

​⁺5 so you move (count) five to the right

​^-5 so you move (count) five to the left

​Subtraction is trickier. Subtracting a positive means moving left while subtracting a negative means moving right.

SUBTRACTING Integers on a Number Line

​4 - ⁺5

​4 - ^-5

​Since addition tends to be easier we are going to rewrite subtraction problems as addition problems

Changing Subtraction to Addition

-2 - ^-7

Keep - Change - Opposite

8 - 14

Multiple Choice

Rewrite as an addition problem.

9 - 6

• 9 + -6

• -9 + -6

• 9 - -6

• 9 + 6

• -9 + 6

Math Response

Rewrite as an addition problem.

19 - 23

Type answer here

Correct Answer: 19+-23

Deg^°

Rad

Modeling SUBTRACTION on a Number Line

-5 - (-3)

Best to change it to an addition problem first
Keep - Change - Opposite​

EXAMPLE

​-4 - 5

​-4 - (-5)

EXAMPLES

​What is the ADDITION problem modeled?

EXAMPLE

​What is the SUBTRACTION problem modeled?

Dropdown

Given the number line, the ADDITION problem it represents is ​

Select answer

and the SUBTRACTION problem it represents is ​

Select answer

.

Multiple Choice

Which SUBTRACTION equation matches the problem shown on the number line?

• 7 - 5 = 2

• 7 - 2 = 2

• 7 - -5 = 2

• 5 + -7 = 2

Open Ended

Take a picture of the notes you took for this lesson.