Keystones — Lintel
Five GCSE retrieval questions · 20 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000096 in standard form
Answer: 9.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 32
Answer: (x - 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 18.84cm -
4. Ratio Mixed ratio problems
Express the second part of 14:15 as a fraction in simplest form
Answer: 15⁄29 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 43, 15, what is the missing number?
Answer: 52