Keystones — Lintel
Five GCSE retrieval questions · 11 July 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.088
Answer: 8.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 55°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Divide 174 in the ratio 1:3:2
Answer: 29, 87 and 58 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 34, 38, 22, 31, what is the missing number?
Answer: 55