Keystones — Lintel
Five GCSE retrieval questions · 2 May 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00087
Answer: 8.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 45°. Find opposite
Answer: 16cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:12
Answer: 6:3:4 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 41, 22, 46, what is the missing number?
Answer: -9