Keystones — Lintel
Five GCSE retrieval questions · 11 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.07 in standard form
Answer: 7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 90
Answer: (x + 10)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 14.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 45p
Answer: 100:9 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 35, 36, 30, 28, 41, what is the missing number?
Answer: 34