Keystones — Lintel
Five GCSE retrieval questions · 4 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 86,000 in standard form
Answer: 8.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 14.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio £7 : 35p
Answer: 20:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 30, 35, 24, what is the missing number?
Answer: 31