Keystones — Lintel
Five GCSE retrieval questions · 13 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000098 in standard form
Answer: 9.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.11cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 850 ml
Answer: 20:17 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 34, 38, 37, what is the missing number?
Answer: 7