Keystones — Lintel
Five GCSE retrieval questions · 21 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00094 in standard form
Answer: 9.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.61cm -
4. Ratio Mixed ratio problems
Divide 170 in the ratio 3:4:3
Answer: 51, 68 and 51 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 49, 20, 25, what is the missing number?
Answer: 38