Keystones — Lintel
Five GCSE retrieval questions · 23 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00059
Answer: 5.9 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 57°. Find opposite
Answer: 38.5cm -
4. Ratio Mixed ratio problems
Express the first part of 6:4 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 49, 39, 25, 31, 23, what is the missing number?
Answer: 55