Keystones — Lintel
Five GCSE retrieval questions · 14 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0003 in standard form
Answer: 3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 11.55cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 50g
Answer: 40:1 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 16, 26, 49, what is the missing number?
Answer: 21