Keystones — Lintel
Five GCSE retrieval questions · 9 April 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
14000
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 43°. Find opposite
Answer: 28cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 45, 32, 17, 25, 46, what is the missing number?
Answer: -33