Keystones — Lintel
Five GCSE retrieval questions · 17 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 73,000 in standard form
Answer: 7.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 32
Answer: (x - 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 50p
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 31, 17, 28, what is the missing number?
Answer: 20