Keystones — Lintel
Five GCSE retrieval questions · 23 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
550000
Answer: 5.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 25°. Find adjacent side
Answer: 27.2cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 36, 25, 40, 21, 45, what is the missing number?
Answer: 61