Keystones — Lintel
Five GCSE retrieval questions · 26 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 540,000,000 in standard form
Answer: 5.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.11cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 4:3:3
Answer: 64, 48 and 48 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 30, 40, 38, 32, what is the missing number?
Answer: 25