Keystones — Lintel
Five GCSE retrieval questions · 26 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 46,000 in standard form
Answer: 4.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 9.09cm -
4. Ratio Mixed ratio problems
Express the first part of 15:7 as a fraction in simplest form
Answer: 15⁄22 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 38, 16, 21, 16, what is the missing number?
Answer: 69