Keystones — Lintel
Five GCSE retrieval questions · 22 October 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0077
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 49°. Find adjacent side
Answer: 23cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 41, 25, 37, 29, 24, what is the missing number?
Answer: 42