Keystones — Lintel
Five GCSE retrieval questions · 23 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0089 in standard form
Answer: 8.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 20
Answer: (x - 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 16.71cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 40 minutes
Answer: 15:2 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 46, 16, 29, 43, 36, what is the missing number?
Answer: 40