Keystones — Lintel
Five GCSE retrieval questions · 26 September 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.089
Answer: 8.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 58°. Find adjacent side
Answer: 12.7cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 17, 20, 49, 24, what is the missing number?
Answer: 85