Keystones — Lintel
Five GCSE retrieval questions · 16 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000019 in standard form
Answer: 1.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.68cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 4:3:2
Answer: 84, 63 and 42 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 34, 46, 28, 18, what is the missing number?
Answer: 19