Keystones — Lintel
Five GCSE retrieval questions · 17 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
510000
Answer: 5.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 58°. Find adjacent side
Answer: 17cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:18
Answer: 3:5:6 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 21, 32, 19, what is the missing number?
Answer: 8