Keystones — Lintel
Five GCSE retrieval questions · 11 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
53000000
Answer: 5.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 36°. Find opposite
Answer: 19.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 17, 41, 18, what is the missing number?
Answer: 84