Keystones — Lintel
Five GCSE retrieval questions · 31 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000083 in standard form
Answer: 8.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 14.43cm -
4. Ratio Mixed ratio problems
Express the second part of 6:10 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 43, 29, 29, what is the missing number?
Answer: 23