Keystones — Lintel
Five GCSE retrieval questions · 10 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
26000
Answer: 2.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 36°. Find opposite
Answer: 21.8cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 49, 21, 42, 46, 33, what is the missing number?
Answer: 19