Keystones — Lintel
Five GCSE retrieval questions · 5 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00064
Answer: 6.4 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 39°. Find adjacent side
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Simplify: 20:8:12
Answer: 5:2:3 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 34, 42, 19, 50, what is the missing number?
Answer: 50