Keystones — Lintel
Five GCSE retrieval questions · 8 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.045
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 37°. Find opposite
Answer: 8.3cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 19, 27, 20, 19, 19, what is the missing number?
Answer: 112