Keystones — Lintel
Five GCSE retrieval questions · 16 September 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
24000
Answer: 2.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 64°. Find adjacent side
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Divide 75 in the ratio 2:1:2
Answer: 30, 15 and 30 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 21, 20, 31, 36, 35, what is the missing number?
Answer: -11