Keystones — Lintel
Five GCSE retrieval questions · 2 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00091 in standard form
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.25cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 5:12:10. What fraction of the sweets are pink?
Answer: 10⁄27 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 37, 22, 34, what is the missing number?
Answer: 11