Keystones — Lintel
Five GCSE retrieval questions · 8 December 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0084
Answer: 8.4 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 31°. Find opposite
Answer: 8.4cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 45, 19, 19, what is the missing number?
Answer: -3