Keystones — Lintel
Five GCSE retrieval questions · 24 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
28000000
Answer: 2.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 25°. Find adjacent side
Answer: 22.7cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:15
Answer: 4:3:5 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 47, 22, 16, 30, what is the missing number?
Answer: 45