755 prompts matching "The standard deviation of grouped data using an assumed mean"
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Common sign errors in algebraic manipulation
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Common mistakes with composite and inverse functions
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Learn: Telling a rational number from an irrational one
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Show All Working: Classifying a mixed list of numbers as rational or irrational
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Common Mistakes: Why a rational number added to an irrational one stays irrational
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WAEC Prep: Ordering a list of surds by size
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Show All Working: Deciding whether two given surds are equal without a calculator
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Common Mistakes: Expressing root 50 as a multiple of root 2
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Final Revision: Surds that cannot be combined at all
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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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Show All Working: A conjugate where the surd term comes first
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Final Revision: Checking a conjugate answer by multiplying back
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Learn: Solving an equation with a single square root term
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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: A binary operation defined on a set of three elements
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Final Revision: Deciding whether a given rule really is a binary operation
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Learn: What closure means for a binary operation
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