Keystones — Lintel
Five GCSE retrieval questions · 7 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.47cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 8:4:12. What fraction of the sweets are black?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 20, 30, 31, 30, what is the missing number?
Answer: 19