Keystones — Lintel
Five GCSE retrieval questions · 13 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00067
Answer: 6.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 40°. Find adjacent side
Answer: 16.cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 2:4:3
Answer: 42, 84 and 63 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 27, 25, 21, 36, what is the missing number?
Answer: 16