Keystones — Lintel
Five GCSE retrieval questions · 20 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0082
Answer: 8.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 61°. Find adjacent side
Answer: 10.2cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:24
Answer: 1:3:3 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 50, 36, 29, 29, 18, what is the missing number?
Answer: -18