Keystones — Lintel
Five GCSE retrieval questions · 26 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0051 in standard form
Answer: 5.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 41.42cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:18
Answer: 5:4:6 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 29, 26, 38, what is the missing number?
Answer: 15