Keystones — Lintel
Five GCSE retrieval questions · 12 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00045
Answer: 4.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 48°. Find adjacent side
Answer: 17.4cm -
4. Ratio Mixed ratio problems
Simplify: 8:12:10
Answer: 4:6:5 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 44, 32, 42, 33, what is the missing number?
Answer: 49