Keystones — Lintel
Five GCSE retrieval questions · 12 April 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0024
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 48°. Find adjacent side
Answer: 16.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 33, 32, 23, what is the missing number?
Answer: 68