Keystones — Lintel
Five GCSE retrieval questions · 30 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00064
Answer: 6.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 28°. Find adjacent side
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Divide 65 in the ratio 2:1:2
Answer: 26, 13 and 26 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 39, 38, 42, 42, 40, what is the missing number?
Answer: 39