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Why is mental addition and subtraction important when you learn more difficult concept
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Why is mental addition and subtraction important when you learn more difficult concept

User Tiago Lira
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It is important because addition is the opposing method of multiplication and subtraction is the opposing method to division. And you need to fluent and fast when it comes to real life!
User GabeIsman
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It is important so you can be more fluent or faster in knowing bigger problems
User NiL
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