Keystones — Lintel
Five GCSE retrieval questions · 16 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0059
Answer: 5.9 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 60°. Find adjacent side
Answer: 10cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 4:1:2
Answer: 48, 12 and 24 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 29, 43, 20, what is the missing number?
Answer: 8