Keystones — Lintel
Five GCSE retrieval questions · 19 December 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
14000000
Answer: 1.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 56°. Find opposite
Answer: 23.7cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 27, 30, 29, what is the missing number?
Answer: 2