Keystones — Lintel
Five GCSE retrieval questions · 3 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0023
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 53°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Simplify: 16:12:20
Answer: 4:3:5 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 21, 35, 22, 48, what is the missing number?
Answer: -21