Keystones — Lintel
Five GCSE retrieval questions · 21 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.035 in standard form
Answer: 3.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.06cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 3:3:11. What fraction of the counters are purple?
Answer: 3⁄17 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 34, 28, 31, 45, 40, what is the missing number?
Answer: 38