Keystones — Lintel
Five GCSE retrieval questions · 31 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00084 in standard form
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.45cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 11:7:1. What fraction of the counters are black?
Answer: 11⁄19 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 43, 40, 29, what is the missing number?
Answer: 24