Keystones — Lintel
Five GCSE retrieval questions · 6 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x + 16
Answer: (x + 4)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 14.83cm -
4. Ratio Mixed ratio problems
Express the first part of 4:7 as a fraction in simplest form
Answer: 4⁄11 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 23, 20, 20, what is the missing number?
Answer: 17