Keystones — Lintel
Five GCSE retrieval questions · 8 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.017 in standard form
Answer: 1.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.79cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 13:9. What fraction of the sweets are orange?
Answer: 13⁄22 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 50, 18, 35, 21, 46, what is the missing number?
Answer: 70