Keystones — Lintel
Five GCSE retrieval questions · 4 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00016
Answer: 1.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 31°. Find opposite
Answer: 18cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:12
Answer: 5:6:3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 49, 34, 50, 23, 43, what is the missing number?
Answer: -19