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Spot the error flashcards

6 cards drawn from 4 lessons: 6 spot-the-error cards. The favourite wrong turns, and why each one fails. Rate each answer to set a shorter or longer interval before the card is due again.

Years 12-13 · all 271 maths cards

How the five kinds differ

Standard results ask for a formula or value that may need to be recalled. Definitions ask for a mathematical term to be stated precisely. Recall prompts ask for a rule, condition or method. Check yourself cards contain a short question and answer. Spot the error cards ask you to correct an inaccurate claim.

Every card in this deck

Click any card to try it in the player above; the card itself links the lesson that teaches it.

• √(a² + b²) simplifies to a + b.Spot the error
• (x + 3)² = x² + 9.Spot the error
• In (x² + 5x)/x², the x² terms cancel to leave 1 + 5x.Spot the error
• If sin x = 0.5 then x = 30° is the complete answer.Spot the error
• Dividing both sides of x² = 4x by x gives x = 4, done.Spot the error
• ln(a)/ln(b) simplifies to ln(a/b).Spot the error

The lessons these cards come from

• Logarithms and their laws
• Polynomials and the factor theorem
• Quadratic functions
• Trigonometric graphs and equations

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