Keystones — Lintel
Five GCSE retrieval questions · 8 October 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0076
Answer: 7.6 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 32°. Find adjacent side
Answer: 33.9cm -
4. Ratio Mixed ratio problems
Divide 270 in the ratio 2:3:4
Answer: 60, 90 and 120 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 44, 32, 38, what is the missing number?
Answer: 18