755 prompts matching "Using concurrence to locate an unknown line of action"
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Explaining the difference between an expression and an equation
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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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Final Revision: Approximating a surd to three decimal places
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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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Learn: Simplifying root 72 into its simplest form
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Worked Example: Adding two surds that simplify to the same root
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Learn: Why a surd is never left in the denominator
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Worked Example: Rationalising a denominator that is a single surd
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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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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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Spot My Mistake: A binary operation defined on a set of three elements
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Learn: What closure means for a binary operation
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Common Mistakes: Closure on a set of three elements under a stated rule
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