Keystones — Lintel
Five GCSE retrieval questions · 1 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00041 in standard form
Answer: 4.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 27.04cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 4:1:1
Answer: 96, 24 and 24 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 29, 43, 39, what is the missing number?
Answer: 37