Keystones — Lintel
Five GCSE retrieval questions · 3 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
70000000
Answer: 7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 57°. Find opposite
Answer: 26.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 50, 16, 45, 29, 35, what is the missing number?
Answer: -43