Keystones — Lintel
Five GCSE retrieval questions · 5 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,500,000 in standard form
Answer: 6.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 38.56cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 5 minutes
Answer: 36:1 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 35, 25, 16, 26, what is the missing number?
Answer: 58