Keystones — Lintel
Five GCSE retrieval questions · 12 December 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
210000
Answer: 2.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 34°. Find opposite
Answer: 8.cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 17, 47, 38, 41, what is the missing number?
Answer: -43