Keystones — Lintel
Five GCSE retrieval questions · 12 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00094 in standard form
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 37°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.58cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 9:1:3. What fraction of the counters are red?
Answer: 9⁄13 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 49, 39, 31, 40, 44, what is the missing number?
Answer: 13