Keystones — Lintel
Five GCSE retrieval questions · 10 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 72
Answer: (x - 6)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 14.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio £8 : 60p
Answer: 40:3 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 49, 40, 44, 40, what is the missing number?
Answer: 7