Keystones — Lintel
Five GCSE retrieval questions · 27 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
99000
Answer: 9.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 63°. Find adjacent side
Answer: 12.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 18, 30, 45, 30, what is the missing number?
Answer: -23