Keystones — Lintel
Five GCSE retrieval questions · 20 July 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
770000
Answer: 7.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 39°. Find adjacent side
Answer: 17.9cm -
4. Ratio Mixed ratio problems
Divide 240 in the ratio 4:1:3
Answer: 120, 30 and 90 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 46, 23, 40, what is the missing number?
Answer: 3