Keystones — Lintel
Five GCSE retrieval questions · 3 July 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00076 in standard form
Answer: 7.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.75cm -
4. Ratio Mixed ratio problems
Divide 261 in the ratio 4:2:3
Answer: 116, 58 and 87 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 38, 30, 48, 46, what is the missing number?
Answer: 23