Keystones — Lintel
Five GCSE retrieval questions · 23 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00077
Answer: 7.7 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 29°. Find adjacent side
Answer: 14.9cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:15
Answer: 3:5:5 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 49, 45, 18, 38, what is the missing number?
Answer: -15