Keystones — Lintel
Five GCSE retrieval questions · 5 January 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
520000
Answer: 5.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 32°. Find opposite
Answer: 14.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 40, 37, 15, 25, 27, what is the missing number?
Answer: 90