Keystones — Lintel
Five GCSE retrieval questions · 13 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00026 in standard form
Answer: 2.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.06cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 5:7. What fraction of the counters are black?
Answer: 5⁄12 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 21, 49, 26, 42, what is the missing number?
Answer: 7