Keystones — Lintel
Five GCSE retrieval questions · 29 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000,000 in standard form
Answer: 1.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 6.25cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 30cm
Answer: 50:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 36, 38, 23, 23, 50, what is the missing number?
Answer: 52