Subtraction Strategy “CONSTANT DIFFERENCE”

Subtraction Using Constant Difference – 3rd from Trinity Episcopal School on Vimeo.


Constant-difference strategy:
An effective strategy for solving subtraction problems mentally is based on the idea of a constant difference. Constant difference refers to the idea that the difference between two numbers does not change after
adding or subtracting the same quantity to both numbers.
Here is a game that allows students to use constant difference for mentally subtracting numbers:

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