755 prompts matching "Quiz: The zero matrix, and how it differs from nought in arithmetic"
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Spot My Mistake: Dividing one surd by another
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Show All Working: Simplifying a surd expression that contains brackets
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Final Revision: Simplifying a fraction whose numerator and denominator are both surds
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Learn: Why a surd is never left in the denominator
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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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Learn: The conjugate of a compound surd expression
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Practice: Rationalising a denominator of the form a plus root b over c minus root d
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Spot My Mistake: Simplifying the denominator once the conjugate has been used
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Learn: Solving an equation with a single square root term
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Show All Working: Evaluating a repeated operation such as a*(b*c)
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Final Revision: Deciding whether a given rule really is a binary operation
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Show All Working: Showing a set is not closed by a single counter-example
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Final Revision: Why closure is checked before any other property
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Learn: What it means for an operation to be commutative
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Show All Working: An operation that is associative but not commutative
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Spot My Mistake: Checking distributivity from two operation tables
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Learn: What an identity element is
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Spot My Mistake: Finding the inverse of a given element
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Practice: The law for a power raised to another power
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