Keystones — Lintel
Five GCSE retrieval questions · 4 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00016 in standard form
Answer: 1.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 17.32cm -
4. Ratio Mixed ratio problems
£189.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £108.00 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 49, 21, 36, what is the missing number?
Answer: 42