Keystones — Lintel
Five GCSE retrieval questions · 7 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.049 in standard form
Answer: 4.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 45°. Find opposite
Answer: 24cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 100g
Answer: 10:1 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 34, 40, 36, what is the missing number?
Answer: 34