Keystones — Lintel
Five GCSE retrieval questions · 3 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00097 in standard form
Answer: 9.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 40
Answer: (x - 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.17cm -
4. Ratio Mixed ratio problems
Divide 96 in the ratio 1:2:1
Answer: 24, 48 and 24 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 42, 39, 18, 38, what is the missing number?
Answer: 18