Keystones — Lintel
Five GCSE retrieval questions · 8 April 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00048
Answer: 4.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite
Answer: 26.2cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 45, 48, 38, 28, 26, what is the missing number?
Answer: -41