Keystones — Lintel
Five GCSE retrieval questions · 19 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 81,000,000 in standard form
Answer: 8.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 8
Answer: (x + 8)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 21.75cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 10 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 40, 32, 30, 16, what is the missing number?
Answer: 57