Keystones — Lintel
Five GCSE retrieval questions · 19 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0048 in standard form
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.23cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m : 40cm
Answer: 20:1 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 35, 42, 32, 32, 24, what is the missing number?
Answer: 69