Keystones — Lintel
Five GCSE retrieval questions · 26 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
1700000
Answer: 1.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 43°. Find opposite
Answer: 16.8cm -
4. Ratio Mixed ratio problems
Express the first part of 3:2 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 42, 16, 30, what is the missing number?
Answer: 44