Keystones — Lintel
Five GCSE retrieval questions · 18 November 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
71000000
Answer: 7.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 60°. Find adjacent side
Answer: 19.5cm -
4. Ratio Mixed ratio problems
Divide 115 in the ratio 1:1:3
Answer: 23, 23 and 69 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 39, 31, 40, what is the missing number?
Answer: 6