Keystones — Lintel
Five GCSE retrieval questions · 30 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0005
Answer: 5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 46°. Find opposite
Answer: 25.9cm -
4. Ratio Mixed ratio problems
Divide 153 in the ratio 4:4:1
Answer: 68, 68 and 17 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 38, 47, 44, 21, 23, what is the missing number?
Answer: 7