Keystones — Lintel
Five GCSE retrieval questions · 24 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 830,000 in standard form
Answer: 8.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 40
Answer: (x - 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.51cm -
4. Ratio Mixed ratio problems
Divide 160 in the ratio 3:3:4
Answer: 48, 48 and 64 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 43, 50, 38, 47, what is the missing number?
Answer: 12