Keystones — Lintel
Five GCSE retrieval questions · 21 October 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.064
Answer: 6.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 14
Answer: (x - 2)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 59°. Find adjacent side
Answer: 10.8cm -
4. Ratio Mixed ratio problems
Divide 330 in the ratio 4:3:4
Answer: 120, 90 and 120 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 20, 31, 33, what is the missing number?
Answer: 24