Keystones — Lintel
Five GCSE retrieval questions · 27 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000083 in standard form
Answer: 8.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 55
Answer: (x - 5)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 46.41cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 250g
Answer: 12:1 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 39, 29, 22, 36, 27, what is the missing number?
Answer: 57