Keystones — Lintel
Five GCSE retrieval questions · 31 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000063 in standard form
Answer: 6.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 15cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 50p
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 18, 33, 33, what is the missing number?
Answer: 16