Keystones — Lintel
Five GCSE retrieval questions · 10 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00076 in standard form
Answer: 7.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 36
Answer: (x + 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.01cm -
4. Ratio Mixed ratio problems
Divide 252 in the ratio 1:4:4
Answer: 28, 112 and 112 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 26, 32, 24, what is the missing number?
Answer: 62