Keystones — Lintel
Five GCSE retrieval questions · 14 June 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00068
Answer: 6.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 4
Answer: (x - 2)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 44°. Find adjacent side
Answer: 12.9cm -
4. Ratio Mixed ratio problems
Divide 154 in the ratio 3:4:4
Answer: 42, 56 and 56 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 48, 43, 38, 48, 32, what is the missing number?
Answer: -17