Keystones — Lintel
Five GCSE retrieval questions · 22 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
2600000
Answer: 2.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 30°. Find opposite
Answer: 12.7cm -
4. Ratio Mixed ratio problems
Simplify: 16:20:12
Answer: 4:5:3 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 24, 30, 35, 26, 27, what is the missing number?
Answer: -16