Keystones — Lintel
Five GCSE retrieval questions · 27 March 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 35°. Find opposite
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Simplify: 18:6:6
Answer: 3:1:1 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 23, 40, 19, 38, 23, what is the missing number?
Answer: 61