Keystones — Lintel
Five GCSE retrieval questions · 19 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0029 in standard form
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:24
Answer: 1:3:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 25, 40, 37, 41, 50, what is the missing number?
Answer: 29