Keystones — Lintel
Five GCSE retrieval questions · 31 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00096 in standard form
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 12.35cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 30 minutes
Answer: 8:1 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 28, 46, 27, 35, 17, what is the missing number?
Answer: 21