739 prompts matching "Learn: What makes an argument valid"
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Final Revision: Simplifying a fraction whose numerator and denominator are both surds
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Spot My Mistake: Rationalising and then cancelling a common factor
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Show All Working: Checking a rationalised answer by decimal approximation
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Final Revision: Expressing a rationalised answer in the form a root b over c
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WAEC Prep: Expressing the answer in the form a plus b root c
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Final Revision: Checking a conjugate answer by multiplying back
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Quiz: Checking a surd equation for extraneous roots
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Practice: Solving an equation with a surd on each side
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WAEC Prep: Equating the rational and the irrational parts of an equation
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Show All Working: Finding a and b when a plus b root 2 equals a given surd
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Final Revision: A word problem that leads to an equation in surd form
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Spot My Mistake: Reading closure off an operation table
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WAEC Prep: A set closed under one operation but not another
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Final Revision: Why closure is checked before any other property
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Practice: An operation that is not commutative, with a counter-example
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WAEC Prep: An operation that is commutative but not associative
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Show All Working: An operation that is associative but not commutative
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Final Revision: Why brackets matter when an operation is not associative
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Quiz: Left distributivity and right distributivity
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Show All Working: Using distributivity to simplify an expression
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