Keystones — Lintel
Five GCSE retrieval questions · 7 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.026 in standard form
Answer: 2.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.03cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 750g
Answer: 8:1 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 36, 34, 35, 16, what is the missing number?
Answer: 64