Keystones — Lintel
Five GCSE retrieval questions · 14 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.078 in standard form
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 17.16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 400 ml
Answer: 10:1 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 31, 26, 49, 21, what is the missing number?
Answer: 68