Keystones — Lintel
Five GCSE retrieval questions · 18 May 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
580000
Answer: 5.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 54°. Find opposite
Answer: 28.9cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 41, 21, 33, what is the missing number?
Answer: 49