Keystones — Lintel
Five GCSE retrieval questions · 7 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00073
Answer: 7.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 62°. Find adjacent side
Answer: 18.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 19, 35, 18, 41, 44, what is the missing number?
Answer: -1