Keystones — Lintel
Five GCSE retrieval questions · 9 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
39000000
Answer: 3.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 49°. Find adjacent side
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:20
Answer: 3:3:5 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 20, 49, 35, 32, 32, what is the missing number?
Answer: -30