Keystones — Lintel
Five GCSE retrieval questions · 25 March 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00051
Answer: 5.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 45°. Find adjacent side
Answer: 13.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 25, 15, 42, 16, what is the missing number?
Answer: 17