Keystones — Lintel
Five GCSE retrieval questions · 20 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000044 in standard form
Answer: 4.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 55
Answer: (x + 11)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 29.65cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 12:12:3. What fraction of the counters are yellow?
Answer: 1⁄9 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 26, 50, 38, what is the missing number?
Answer: 26