Keystones — Lintel
Five GCSE retrieval questions · 19 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000048 in standard form
Answer: 4.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 27.21cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 11:11:2. What fraction of the sweets are pink?
Answer: 1⁄12 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 23, 32, 45, 49, what is the missing number?
Answer: 6