Keystones — Lintel
Five GCSE retrieval questions · 1 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000065 in standard form
Answer: 6.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 12.5cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 7:2:6. What fraction of the marbles are pink?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 32, 17, 49, 33, what is the missing number?
Answer: 44