Keystones — Lintel
Five GCSE retrieval questions · 21 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00086
Answer: 8.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 61°. Find adjacent side
Answer: 14.cm -
4. Ratio Mixed ratio problems
In ratio 3:4:1, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 43, 25, 50, what is the missing number?
Answer: 2