Keystones — Lintel
Five GCSE retrieval questions · 13 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0013 in standard form
Answer: 1.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 45°. Find opposite
Answer: 28cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 14:12. What fraction of the sweets are blue?
Answer: 6⁄13 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 45, 18, 33, what is the missing number?
Answer: 64