The multiplicative inverse sounds like a weird scifi concept, but it's really just multiplying a fraction by its reciprocal—otherwise known as the same fraction flipped upside down. It's like an roller coaster ride for fractions! Just make sure they don't eat too much cotton candy beforehand.

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Using the Multiplicative Inverse to Solve Equations 
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SAT Diagnostic #2 
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Distributive Property 
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Algebra y Funciones, Problema de la Palabra 
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Combining Like Terms 
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Numbers and Operations: Elementary Number Theory 
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Teoría Elemental de los Números 
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Solving TwoStep Equations using Addition and Subtraction