Use constant difference to balance equations and find unknowns
Lesson 9 / 10
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Lesson outcome
I can use the same difference rule to balance equations.
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If I add __ to the minuend and add the same number to the subtrahend, the difference stays the same.
If I subtract __ from the minuend and add the same number to the subtrahend, the difference stays the same.
A number line can be used to represent the 'same difference' generalization.
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