Keystones — Lintel
Five GCSE retrieval questions · 4 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
87000
Answer: 8.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 30°. Find opposite
Answer: 9.8cm -
4. Ratio Mixed ratio problems
Express the first part of 4:3 as a fraction in simplest form
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 40, 50, 24, what is the missing number?
Answer: -26