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Expressions and Equations: Multi-Step Problems and Reasonableness
Working Backwards
Description
Working Backwards
Introduction
Working backward is useful when the final result is known, but the starting value is unknown. Each operation is undone in reverse order to recover the original value.
Theory
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Transcript
Diego finishes the hardest level in his favorite video game, and the screen shows a final total of 40 gold coins.
The challenge is to find out how many coins he had before the level began.
During the level, a treasure chest doubled his coins, and a spike trap then took away 10 coins.
The situation is represented by the equation...
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