Keystones — Lintel
Five GCSE retrieval questions · 11 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,800,000 in standard form
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 99
Answer: (x + 11)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Simplify: 24:8:8
Answer: 3:1:1 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 31, 25, 43, what is the missing number?
Answer: 49