Keystones — Lintel
Five GCSE retrieval questions · 10 November 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 92,000,000 in standard form
Answer: 9.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 19.58cm -
4. Ratio Mixed ratio problems
£220.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £88.00 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 28, 29, what is the missing number?
Answer: 53