Keystones — Lintel
Five GCSE retrieval questions · 29 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000098 in standard form
Answer: 9.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 37.05cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 10:4:3. What fraction of the counters are green?
Answer: 3⁄17 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 39, 27, 24, 23, what is the missing number?
Answer: 32