Keystones — Lintel
Five GCSE retrieval questions · 23 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
570000
Answer: 5.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 55°. Find opposite
Answer: 18.6cm -
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 40. If 4 of them are 20, 50, 43, 42, what is the missing number?
Answer: 45