Keystones — Lintel
Five GCSE retrieval questions · 14 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0001
Answer: 1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 57°. Find opposite
Answer: 24.6cm -
4. Ratio Mixed ratio problems
Simplify: 15:6:6
Answer: 5:2:2 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 46, 43, 29, 16, 42, what is the missing number?
Answer: -38