Keystones — Lintel
Five GCSE retrieval questions · 15 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 350,000,000 in standard form
Answer: 3.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.86cm -
4. Ratio Mixed ratio problems
Red, blue and green sweets are in the ratio 3:10:5. What fraction of the sweets are blue?
Answer: 5⁄9 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 29, 35, 50, what is the missing number?
Answer: 38