Keystones — Lintel
Five GCSE retrieval questions · 18 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00053 in standard form
Answer: 5.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 850 ml
Answer: 40:17 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 32, 18, 37, 23, what is the missing number?
Answer: 10