Keystones — Lintel
Five GCSE retrieval questions · 9 October 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
510000
Answer: 5.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 56°. Find opposite
Answer: 20.8cm -
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 33. If 3 of them are 44, 40, 39, what is the missing number?
Answer: 9