869 prompts matching "WAEC past questions: Why casting out nines catches some errors and not others"
Worked example: Finding a tangent length with Pythagoras
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Quiz: The formula for the nth term of an arithmetic progression
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Practice: Reading a frequency from a bar of given width and density
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Quiz: Showing a combined solution on a number line
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Practice: Taking the square root at the final step
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Practice: Listing a set, and describing it by a rule
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Learn: Interpolation within the range of the data
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Practice: When the display has already rounded the true answer
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Spot my mistake: Dividing through before completing the square
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Practice: The surface area of an open box
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Practice: Substituting carefully when x is negative
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Spot my mistake: Dividing by an algebraic fraction by inverting it
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Worked example: Calculating class widths from the boundaries
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Practice: Recognising a reciprocal or exponential from its form
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Learn: Reading the turning point straight from the completed square
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Practice: Finding a missing angle on a straight line
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Practice: A negative index read as a reciprocal
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Practice: Finding a distance from an angle of elevation
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Practice: Starting from the intersection when filling a Venn diagram
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Practice: Finding the length of a prism from its volume
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