Keystones — Lintel
Five GCSE retrieval questions · 11 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000054 in standard form
Answer: 5.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 10cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 20 minutes
Answer: 3:1 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 42, 18, 35, what is the missing number?
Answer: 21