Keystones — Lintel
Five GCSE retrieval questions · 17 June 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00083
Answer: 8.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 48°. Find opposite
Answer: 32.2cm -
4. Ratio Mixed ratio problems
Express the first part of 6:2 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 25, 15, 29, 25, what is the missing number?
Answer: 96