Keystones — Lintel
Five GCSE retrieval questions · 3 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.064 in standard form
Answer: 6.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.73cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 55 minutes
Answer: 24:11 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 19, 28, 42, what is the missing number?
Answer: 31