Keystones — Lintel
Five GCSE retrieval questions · 21 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,900,000 in standard form
Answer: 3.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.43cm -
4. Ratio Mixed ratio problems
£261.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £116.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 48, 18, 30, 46, 35, what is the missing number?
Answer: 57