Keystones — Lintel
Five GCSE retrieval questions · 29 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000078 in standard form
Answer: 7.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 15.92cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:6
Answer: 6:2:3 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 42, 21, 19, 45, what is the missing number?
Answer: 28