Keystones — Lintel
Five GCSE retrieval questions · 9 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00015 in standard form
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 5.77cm -
4. Ratio Mixed ratio problems
Divide 147 in the ratio 2:4:1
Answer: 42, 84 and 21 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 19, 46, 24, 19, 20, what is the missing number?
Answer: 70