Keystones — Lintel
Five GCSE retrieval questions · 26 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
500000
Answer: 5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 34°. Find opposite
Answer: 18.2cm -
4. Ratio Mixed ratio problems
Express the first part of 2:6 as a fraction in simplest form
Answer: 1⁄4 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 30, 31, 40, what is the missing number?
Answer: -21