Keystones — Lintel
Five GCSE retrieval questions · 12 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00043
Answer: 4.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 44°. Find opposite
Answer: 21.2cm -
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 26. If 5 of them are 18, 28, 21, 40, 45, what is the missing number?
Answer: 4