Keystones — Lintel
Five GCSE retrieval questions · 20 January 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0005
Answer: 5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite
Answer: 15.8cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:15
Answer: 5:6:5 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 36, 19, 50, 41, what is the missing number?
Answer: -36