Strategies for Adding & Subtracting Integers
Strategies for Adding & Subtracting Integers
(positive & negative whole numbers)
1. Song to help you remember how to add and subtract integers:
Same signs, add and keep
Different signs subtract
Keep the sign of the bigger #
And then you’ll be exact!
(Sung to “Row, row, row your boat”)
2. KOOL to change a subtraction sentence into addition:
K O O L
e p p e
e p p t’
p o o s
s s
i i a
t t d
e e d
Keep the first number
Change the operation to opposite
Change the 2nd # to its opposite
Add to find the sum
Ex: -5 - 6 =
K O O L
-5 + (-6) = -11
3. “Walk the Number Line”:
+ (add) = face positive numbers
- (sub.) = face negative numbers
If 2nd number is…
positive = walk forward
negative = walk backwards
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