Keystones — Lintel
Five GCSE retrieval questions · 6 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
42000000
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 32°. Find adjacent side
Answer: 33.9cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 3:3:1
Answer: 72, 72 and 24 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 35, 18, 29, what is the missing number?
Answer: 2