Keystones — Lintel
Five GCSE retrieval questions · 27 March 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0079
Answer: 7.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 53°. Find adjacent side
Answer: 13.8cm -
4. Ratio Mixed ratio problems
In ratio 4:3:1, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 19, 29, 33, what is the missing number?
Answer: 31