Keystones — Lintel
Five GCSE retrieval questions · 5 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0078
Answer: 7.8 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 59°. Find opposite
Answer: 48.3cm -
4. Ratio Mixed ratio problems
Express the first part of 6:5 as a fraction in simplest form
Answer: 6⁄11 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 34, 15, 41, 33, 33, what is the missing number?
Answer: -18