Keystones — Lintel
Five GCSE retrieval questions · 30 April 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 640,000,000 in standard form
Answer: 6.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 15.53cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 20 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 24, 18, 24, 36, what is the missing number?
Answer: 8