Keystones — Lintel
Five GCSE retrieval questions · 7 December 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00034
Answer: 3.4 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 55°. Find opposite
Answer: 22.9cm -
4. Ratio Mixed ratio problems
Express the first part of 5:6 as a fraction in simplest form
Answer: 5⁄11 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 36, 29, 22, 24, what is the missing number?
Answer: 54