Keystones — Lintel
Five GCSE retrieval questions · 12 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 45,000,000 in standard form
Answer: 4.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 34.58cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 850g
Answer: 60:17 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 44, 18, 23, 48, what is the missing number?
Answer: 27