Keystones — Lintel
Five GCSE retrieval questions · 18 June 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00035
Answer: 3.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 32°. Find opposite
Answer: 16.2cm -
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 35. If 4 of them are 28, 31, 33, 26, what is the missing number?
Answer: 57