Addition and Subtraction of Integers on a Number Line
We are learning to…use a number line to add and subtract integers.
Wednesday, April 19, 2023
Directions for adding and subtracting integers on a number line…
1. Start on the…first number in the expression.
2. To know which way to face on the number line look at the…sign of the second number in the expression.
If it is positive face right because the positives are to the right on the number line.
If it is negative face left because the negatives are to the left on the number line.
3. To move just remember: If you are adding…move forward. If you are subtracting…move backward.
Expression
-4 + 5
Start On… Face… Move…
Solution:
Equivalent Expression:
-4 The positives Forward5 steps
1 -4 – (-5)
Expression
-1 – (-6)
Start On… Face… Move…
Solution:
Equivalent Expression:
-1 The negatives Backward6 steps
5 -1 + 6
Expression
3 + (-7)
Start On… Face… Move…
Solution:
Equivalent Expression:
3 The negatives Forward 7 steps
-4 3 – 7
Expression
-2 – 7
Start On… Face… Move…
Solution:
Equivalent Expression:
-2 The positives Backward7 steps
-9 -2 + (-7)
Expression
5 – (-5)
Start On… Face… Move…
Solution:
Equivalent Expression:
5 The negatives Backward5 steps
10
5 + 5
Expression
-8 – (-17)
Start On… Face… Move…
Solution:
Equivalent Expression:
-8 The negatives Backward17 steps
9 -8 + 17
NegativeNumbers
NumbersDecreasing
NumbersIncreasing
PositiveNumbers
Adding a Negative
Adding a Positive
Subtracting a Negative
Subtracting a Positive
Make Connections!
Adding a negative is the same as:_____________________
Adding a positive is the same as:______________________
Subtracting a positive is the same as:__________________
Subtracting a negative is the same as:__________________
Adding a Negative
Subtracting a Negative
Subtracting a Positive
Adding a Positive
Practice using a number line to add and subtract some integers with your
teammates…think about an equivalent expressions as you are working!
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