Keystones — Lintel
Five GCSE retrieval questions · 20 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0025 in standard form
Answer: 2.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:20
Answer: 5:6:5 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 18, 31, 34, what is the missing number?
Answer: 57