Keystones — Lintel
Five GCSE retrieval questions · 13 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0062 in standard form
Answer: 6.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 8
Answer: (x - 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 41.58cm -
4. Ratio Mixed ratio problems
In ratio 3:1:1, what fraction is the second part?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 18, 17, 16, what is the missing number?
Answer: 45