Keystones — Lintel
Five GCSE retrieval questions · 5 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.06 in standard form
Answer: 6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 12.14cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 500g
Answer: 6:1 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 16, 22, 24, 38, what is the missing number?
Answer: 5