Keystones — Lintel
Five GCSE retrieval questions · 5 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00091
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 31°. Find opposite
Answer: 7.2cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:4
Answer: 3:3:2 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 27, 23, 46, 46, what is the missing number?
Answer: 3