Keystones — Lintel
Five GCSE retrieval questions · 2 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00077 in standard form
Answer: 7.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.4cm -
4. Ratio Mixed ratio problems
Express the second part of 6:12 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 29, 23, 40, 21, what is the missing number?
Answer: 37