Keystones — Lintel
Five GCSE retrieval questions · 28 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
20000000
Answer: 2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 40°. Find adjacent side
Answer: 27.6cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:9
Answer: 3:4:3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 24, 50, 42, 42, 45, what is the missing number?
Answer: -23