Keystones — Lintel
Five GCSE retrieval questions · 13 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0073
Answer: 7.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 52°. Find adjacent side
Answer: 9.9cm -
4. Ratio Mixed ratio problems
Express the first part of 2:3 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 29, 37, 38, 20, 34, what is the missing number?
Answer: -14