Keystones — Lintel
Five GCSE retrieval questions · 21 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0072 in standard form
Answer: 7.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.08cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 11:8. What fraction of the sweets are blue?
Answer: 8⁄19 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 34, 25, 37, 20, 32, what is the missing number?
Answer: 14