Keystones — Lintel
Five GCSE retrieval questions · 20 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00058
Answer: 5.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 34°. Find opposite
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Divide 200 in the ratio 3:3:2
Answer: 75, 75 and 50 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 19, 18, 30, what is the missing number?
Answer: 21