Keystones — Lintel
Five GCSE retrieval questions · 11 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.041 in standard form
Answer: 4.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 6
Answer: (x + 1)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 15.59cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 40 minutes
Answer: 3:2 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 47, 16, 45, 49, what is the missing number?
Answer: 8