Keystones — Lintel
Five GCSE retrieval questions · 29 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 81,000 in standard form
Answer: 8.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.64cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 50cm
Answer: 10:1 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 43, 18, 40, 39, 26, what is the missing number?
Answer: 20