Keystones — Lintel
Five GCSE retrieval questions · 23 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0008
Answer: 8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 18
Answer: (x - 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 35°. Find opposite
Answer: 14.7cm -
4. Ratio Mixed ratio problems
Simplify: 10:12:8
Answer: 5:6:4 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 19, 50, 50, what is the missing number?
Answer: -27