Keystones — Lintel
Five GCSE retrieval questions · 7 April 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
75000
Answer: 7.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 50°. Find opposite
Answer: 32.2cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 27, 47, 29, 50, what is the missing number?
Answer: 27