Keystones — Lintel
Five GCSE retrieval questions · 15 June 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
15000000
Answer: 1.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 42°. Find opposite
Answer: 16.2cm -
4. Ratio Mixed ratio problems
Simplify: 12:10:4
Answer: 6:5:2 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 43, 28, 42, what is the missing number?
Answer: -9