Keystones — Lintel
Five GCSE retrieval questions · 17 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,100,000 in standard form
Answer: 5.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 45°. Find opposite
Answer: 21cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:2:4
Answer: 30, 20 and 40 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 17, 18, 28, what is the missing number?
Answer: 25