Keystones — Lintel
Five GCSE retrieval questions · 14 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 83,000,000 in standard form
Answer: 8.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Simplify: 10:4:8
Answer: 5:2:4 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 27, 23, 29, what is the missing number?
Answer: 53