Keystones — Lintel
Five GCSE retrieval questions · 7 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000,000 in standard form
Answer: 1.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 6
Answer: (x + 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 24.01cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 50 minutes
Answer: 6:5 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 18, 32, 40, 33, what is the missing number?
Answer: 57