Keystones — Lintel
Five GCSE retrieval questions · 14 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 11,000,000 in standard form
Answer: 1.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 19.99cm -
4. Ratio Mixed ratio problems
£400.00 is shared between A and B in the ratio 5:3. How much does A receive?
Answer: £250.00 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 21, 15, 49, what is the missing number?
Answer: 43