Keystones — Lintel
Five GCSE retrieval questions · 7 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0023 in standard form
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 14.43cm -
4. Ratio Mixed ratio problems
In ratio 10:3:9, what fraction is the third part?
Answer: 9⁄22 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 39, 26, 24, what is the missing number?
Answer: 51