Keystones — Lintel
Five GCSE retrieval questions · 8 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 48
Answer: (x + 12)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.13cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 5:9:12. What fraction of the counters are pink?
Answer: 6⁄13 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 17, 36, 46, what is the missing number?
Answer: 5