Keystones — Lintel
Five GCSE retrieval questions · 14 March 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
79000000
Answer: 7.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 42°. Find opposite
Answer: 17.cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 18, 32, 49, 28, 15, what is the missing number?
Answer: -16