Keystones — Lintel
Five GCSE retrieval questions · 18 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 36°. Find opposite
Answer: 7.3cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 30, 38, 23, what is the missing number?
Answer: 5