Keystones — Lintel
Five GCSE retrieval questions · 1 June 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000044 in standard form
Answer: 4.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 96
Answer: (x + 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 16.21cm -
4. Ratio Mixed ratio problems
Express the first part of 10:15 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 33, 34, 28, 33, what is the missing number?
Answer: 67