755 prompts matching "When the matrix method is worth the work for three unknowns"
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Show All Working: Checking a rationalised answer by decimal approximation
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Spot My Mistake: Simplifying the denominator once the conjugate has been used
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Show All Working: A conjugate where the surd term comes first
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Worked Example: Squaring both sides safely when solving a surd equation
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Show All Working: Showing a set is not closed by a single counter-example
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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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Show All Working: Using distributivity to simplify an expression
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Spot My Mistake: Finding the inverse of a given element
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Show All Working: Simplifying an expression that mixes the index types
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Worked Example: Solving an indicial equation where one side must be factorised first
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Spot My Mistake: The logarithm of the base itself
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Show All Working: The common logarithm, to base ten
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Spot My Mistake: Evaluating an expression using the laws of logarithms
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Spot My Mistake: A logarithm to base e, the natural logarithm
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Spot My Mistake: Finding the common difference from two given terms
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Show All Working: Deciding whether a number belongs to a given arithmetic progression
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Spot My Mistake: The sum of an arithmetic progression with a negative common difference
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Show All Working: The sum of the terms lying between two given positions
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Practice: Reversing the sign when multiplying by a negative number
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