Keystones — Lintel
Five GCSE retrieval questions · 1 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00082
Answer: 8.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 43°. Find adjacent side
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Simplify: 8:16:20
Answer: 2:4:5 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 37, 17, 28, 19, 26, what is the missing number?
Answer: 53