Keystones — Lintel
Five GCSE retrieval questions · 28 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0032 in standard form
Answer: 3.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Divide 77 in the ratio 3:3:1
Answer: 33, 33 and 11 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 16, 33, 26, 37, 28, what is the missing number?
Answer: 34