Keystones — Lintel
Five GCSE retrieval questions · 15 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 67,000 in standard form
Answer: 6.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 14.92cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:8
Answer: 3:4:2 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 21, 42, 29, what is the missing number?
Answer: 44