Keystones — Lintel
Five GCSE retrieval questions · 16 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 920,000 in standard form
Answer: 9.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
Express the second part of 13:14 as a fraction in simplest form
Answer: 14⁄27 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 30, 37, 48, 44, 17, what is the missing number?
Answer: 28