Keystones — Lintel
Five GCSE retrieval questions · 6 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000071 in standard form
Answer: 7.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.22cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 8:9:12. What fraction of the sweets are pink?
Answer: 12⁄29 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 26, 16, 24, 45, 24, what is the missing number?
Answer: 63