Keystones — Lintel
Five GCSE retrieval questions · 30 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00065 in standard form
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 9.33cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 2:3:1
Answer: 40, 60 and 20 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 32, 29, 31, 35, what is the missing number?
Answer: 33