Keystones — Lintel
Five GCSE retrieval questions · 31 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000057 in standard form
Answer: 5.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.43cm -
4. Ratio Mixed ratio problems
£450.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £250.00 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 37, 43, 28, 38, what is the missing number?
Answer: 54