Keystones — Lintel
Five GCSE retrieval questions · 27 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 640,000 in standard form
Answer: 6.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 26.07cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 8:9:3. What fraction of the counters are black?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 44, 36, 33, 34, 43, what is the missing number?
Answer: 38