Keystones — Lintel
Five GCSE retrieval questions · 11 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 10.8cm -
4. Ratio Mixed ratio problems
Divide 275 in the ratio 4:4:3
Answer: 100, 100 and 75 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 47, 29, 39, 30, 20, what is the missing number?
Answer: 45