Keystones — Lintel
Five GCSE retrieval questions · 29 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00095 in standard form
Answer: 9.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 6.25cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 1:2:2
Answer: 22, 44 and 44 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 15, 18, 30, 42, 50, what is the missing number?
Answer: 19