Keystones — Lintel
Five GCSE retrieval questions · 5 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0076
Answer: 7.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 42°. Find opposite
Answer: 22.5cm -
4. Ratio Mixed ratio problems
Express the first part of 2:6 as a fraction in simplest form
Answer: 1⁄4 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 21, 34, 27, 27, what is the missing number?
Answer: 56