Keystones — Lintel
Five GCSE retrieval questions · 27 February 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00061
Answer: 6.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 9
Answer: (x - 3)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 38°. Find adjacent side
Answer: 18.9cm -
4. Ratio Mixed ratio problems
Simplify: 4:10:6
Answer: 2:5:3 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 43, 16, 25, 39, what is the missing number?
Answer: 22