Keystones — Lintel
Five GCSE retrieval questions · 7 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000014 in standard form
Answer: 1.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 132
Answer: (x + 11)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 13:3. What fraction of the sweets are red?
Answer: 13⁄16 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 20, 35, 40, what is the missing number?
Answer: 65