Keystones — Lintel
Five GCSE retrieval questions · 5 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 800g
Answer: 15:4 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 20, 25, 16, 41, 46, what is the missing number?
Answer: 20